Make it so disabled field trials are not reported as active.

BUG=160310
TEST=New FieldTrialTest.DisabledTrialNotActive test and updated existing tests.

Review URL: https://chromiumcodereview.appspot.com/11359136

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@167045 0039d316-1c4b-4281-b951-d872f2087c98
3 files changed