Change PipelineImplTest in media_unittests to workaround gmock bug
Change PipelineImplTest in media_unittests to workaround gmock bug

media_unittests is hanging due to the latest gMock roll.
This hang is caused by a deadlock in gMock described here:
http://code.google.com/p/googlemock/issues/detail?id=79

This workaround works by manually releasing mock objects in
certain order to avoid deadlock.

BUG=38976
TEST=run media_unittests after gmock roll

Review URL: http://codereview.chromium.org/1206001

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@42523 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser