generate_au_zip: Remove unused chromeos-common.sh.

chromeos-common.sh is not used anymore for cros_generate_update_payload.

CQ-DEPEND=CL:284703
BUG=None
TEST=Manual procedure, see below.

Manual procedure:
1. In the chroot:
sudo emerge cros-devutils
./build_library/generate_au_zip.py -o /tmp/`
2. In a new terminal outside the chroot, run sudo and verify it requires
a password (Don't type it).
3. Ran paygen_build_lib._GenerateSinglePayload() with the
au-generator.zip in /tmp and verify it works.

Change-Id: Ic9aa234307dc81127624dd6da90555e60cb57ff3
Reviewed-on: https://chromium-review.googlesource.com/284712
Trybot-Ready: Alex Deymo <deymo@chromium.org>
Tested-by: Alex Deymo <deymo@chromium.org>
Reviewed-by: Gabe Black <gabeblack@chromium.org>
Commit-Queue: Alex Deymo <deymo@chromium.org>
diff --git a/build_library/generate_au_zip.py b/build_library/generate_au_zip.py
index 0ca9141..c23750c 100755
--- a/build_library/generate_au_zip.py
+++ b/build_library/generate_au_zip.py
@@ -36,7 +36,6 @@
 EXECUTABLE_FILES = BINARY_EXECUTABLES + [
     '~/trunk/src/scripts/common.sh',
     '/usr/bin/cros_generate_update_payload',
-    '/usr/share/misc/chromeos-common.sh',
     '/usr/share/vboot/bin/convert_recovery_to_ssd.sh',
     '/usr/share/vboot/bin/common_minimal.sh',
     ]