Fix names of disabled unit tests.

Several tests were renamed from ExperimentsHelperTest.* to
VariationsHelperTest.*.  This updates unit_tests_disabled accordingly,
and should fix the android_test try bot.


Review URL: https://chromiumcodereview.appspot.com/10860021

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@152217 0039d316-1c4b-4281-b951-d872f2087c98

build/android/gtest_filter/unit_tests_disabled

@@ -134,9 +134,9 @@ PrerenderTest.*
 RenderWidgetTest.OnMsgPaintAtSize
 
 # crbug.com/139643
-ExperimentsHelperTest.DisableAfterInitialization
-ExperimentsHelperTest.AssociateGoogleVariationID
-ExperimentsHelperTest.NoAssociation
+VariationsHelperTest.DisableAfterInitialization
+VariationsHelperTest.AssociateGoogleVariationID
+VariationsHelperTest.NoAssociation
 
 # crbug.com/141473
 AutofillManagerTest.UpdatePasswordSyncState