devserver: Remove confusing log message.

If we are unable to import android_build, we either don't expect to use
it (e.g. on a DUT) in which case this error message just adds to
confusion in the logs, or we'll use it and blow up because the module is
set to None.

BUG=chromium:651520
TEST=None.

Change-Id: I266baee1526165af8487ffb257a0bf3eff02d3c9
Reviewed-on: https://chromium-review.googlesource.com/427998
Commit-Ready: Prathmesh Prabhu <pprabhu@chromium.org>
Tested-by: Prathmesh Prabhu <pprabhu@chromium.org>
Reviewed-by: Xixuan Wu <xixuan@chromium.org>
diff --git a/devserver.py b/devserver.py
index 4d50fd6..d9f95f8 100755
--- a/devserver.py
+++ b/devserver.py
@@ -102,7 +102,6 @@
   # inside a ChromeOS device triggered by cros flash. Most ChromeOS test images
   # do not have google-api-python-client module and they don't need to support
   # Android updating, therefore, ignore the import failure here.
-  _Log('Import module android_build failed with error: %s', e)
   android_build = None
 
 CACHED_ENTRIES = 12