Revert "Update autoupdate_ForcedOOBEUpdate to use FakeOmaha."

This reverts commit e1c90bb3c62a8b182dc33f97e51e7baf54e56a50.

Reason for revert: import is invalid on r90. breaks unittest

Original change's description:
> Update autoupdate_ForcedOOBEUpdate to use FakeOmaha.
>
> I'll trial the TLS change with this test before migrating them all.
> I cannot run the test locally with TLS so we will have to test in the
> lab. I have verified that it runs and fails at the same point as the
> infra_TLSFakeOmaha test.
>
> BUG=chromium:1189379
> TEST=autoupdate_ForcedOOBEUpdate and fails with same error as
> infra_TLSFakeOmaha
>
> Change-Id: I9f8782a213a719d2d7a29737462ff05a025f2648
> Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/autotest/+/2815950
> Tested-by: David Haddock <dhaddock@chromium.org>
> Reviewed-by: Derek Beckett <dbeckett@chromium.org>
> Reviewed-by: Kyle Shimabukuro <kyleshima@chromium.org>
> (cherry picked from commit fb17b1a9a412f3e8037988f9c75b4314e80b9b37)
> Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/autotest/+/2861669
> Reviewed-by: David Haddock <dhaddock@chromium.org>
> Commit-Queue: David Haddock <dhaddock@chromium.org>

Bug: chromium:1189379
Change-Id: Id9bb788c09fce7c765b6405ae7ca6ba6662e74a2
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/autotest/+/2875371
Auto-Submit: Derek Beckett <dbeckett@chromium.org>
Reviewed-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
Commit-Queue: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
diff --git a/server/cros/update_engine/update_engine_test.py b/server/cros/update_engine/update_engine_test.py
index 343f243..359138a 100644
--- a/server/cros/update_engine/update_engine_test.py
+++ b/server/cros/update_engine/update_engine_test.py
@@ -29,8 +29,6 @@
 from autotest_lib.server import autotest
 from autotest_lib.server import test
 from autotest_lib.server.cros.dynamic_suite import tools
-from autotest_lib.server.hosts.tls_client import connection
-from autotest_lib.server.hosts.tls_client import fake_omaha
 from autotest_lib.utils.frozen_chromite.lib import auto_updater
 from autotest_lib.utils.frozen_chromite.lib import auto_updater_transfer
 from autotest_lib.utils.frozen_chromite.lib import remote_access
@@ -796,56 +794,6 @@
         return url
 
 
-    def get_update_url_from_fake_omaha(self,
-                                       job_repo_url=None,
-                                       full_payload=True,
-                                       payload_id='ROOTFS',
-                                       critical_update=True,
-                                       exposed_via_proxy=True,
-                                       return_noupdate_starting=0):
-        """
-        Starts a FakeOmaha instance with TLS and returns is update url.
-
-        Some tests that require an omaha instance to survive a reboot will use
-        the FakeOmaha TLS.
-
-        @param job_repo_url: string url containing the current build.
-        @param full_payload: bool whether we want a full payload.
-        @param payload_id: ROOTFS or DLC
-        @param critical_update: True if we want a critical update response.
-        @param exposed_via_proxy: True to tell TLS we want the fakeomaha to be
-                                  accessible after a reboot.
-        @param return_noupdate_starting: int of how many valid update responses
-                                         to return before returning noupdate
-                                        forever.
-
-        @returns an update url on the FakeOmaha instance for tests to use.
-
-        """
-        self._job_repo_url = self._get_job_repo_url(job_repo_url)
-        if not self._job_repo_url:
-            raise error.TestFail('There was no job_repo_url so we cannot get '
-                                 'a payload to use.')
-        gs = dev_server._get_image_storage_server()
-        _, build = tools.get_devserver_build_from_package_url(
-                self._job_repo_url)
-        target_build = gs + build
-        payload_type = 'FULL' if full_payload else 'DELTA'
-        tlsconn = connection.TLSConnection()
-        self.fake_omaha = fake_omaha.TLSFakeOmaha(tlsconn)
-        fake_omaha_url = self.fake_omaha.start_omaha(
-                self._host.hostname,
-                target_build=target_build,
-                payloads=[{
-                        'payload_id': payload_id,
-                        'payload_type': payload_type,
-                }],
-                exposed_via_proxy=True,
-                critical_update=critical_update,
-                return_noupdate_starting=return_noupdate_starting)
-        logging.info('Fake Omaha update URL: %s', fake_omaha_url)
-        return fake_omaha_url
-
     def get_payload_url_on_public_bucket(self, job_repo_url=None,
                                          full_payload=True, is_dlc=False):
         """
diff --git a/server/site_tests/autoupdate_ForcedOOBEUpdate/autoupdate_ForcedOOBEUpdate.py b/server/site_tests/autoupdate_ForcedOOBEUpdate/autoupdate_ForcedOOBEUpdate.py
index 3fa95ef..7fe8375 100644
--- a/server/site_tests/autoupdate_ForcedOOBEUpdate/autoupdate_ForcedOOBEUpdate.py
+++ b/server/site_tests/autoupdate_ForcedOOBEUpdate/autoupdate_ForcedOOBEUpdate.py
@@ -67,8 +67,6 @@
                 # if status is IDLE we need to figure out if an error occurred
                 # or the DUT autorebooted.
                 elif self._is_update_engine_idle(status):
-                    self._host.run(
-                            'ls /mnt/stateful_partition/etc/lsb-release')
                     if self._is_update_finished_downloading(last_status):
                         if len(self._get_update_engine_logs()) > logs_before:
                             return
@@ -131,14 +129,8 @@
             payload_url = self.get_payload_url_on_public_bucket(
                 job_repo_url, full_payload=full_payload)
         else:
-            if moblab:
-                update_url = self.get_update_url_for_test(
-                        job_repo_url, full_payload=full_payload)
-            else:
-                update_url = self.get_update_url_from_fake_omaha(
-                        job_repo_url,
-                        full_payload=full_payload,
-                        return_noupdate_starting=2)
+            update_url = self.get_update_url_for_test(
+                job_repo_url, full_payload=full_payload)
         before_version = self._host.get_release_version()
 
         # Clear any previously started updates.