GTTF: Fix cc_unittests ignoring gtest_filter with new test launcher.

BUG=299200, 236893
R=danakj@chromium.org, jamesr@chromium.org

Review URL: https://codereview.chromium.org/70943002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@235184 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 235184