drive: Rewrite ChangeListProcessorTest to treat local ID properly

BUG=275270
TEST=unit_tests --gtest_filter="ChangeListProcessorTest.ApplyFullResourceList"
R=kinaba@chromium.org

Review URL: https://codereview.chromium.org/26807002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@228098 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 228098
Revert "Disable flaky PepperCDMsNotRegistered test"

This reverts commit cf1559f00543675039488cd7c62c1eaada336b2e.

The flakiness of these tests might already be fixed by r227399. Tentatively
enabling these tests for now. If they are still falky, I'll disable these
tests again.

TBR=ddorwin@chromium.org
BUG=301571

Review URL: https://codereview.chromium.org/26277004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@228099 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 228099