Disable a remote LTH test, we don't deserialize FakePictureLayer.

Currently for LTH remote test, we deserialize FakePictureLayer into
PictureLayer, so on the compositor impl thread, FakePictureLayerImpl
is not created but PictureLayerImpl, which cause downcasting failure.

BUG=657871
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_precise_blink_rel

Review-Url: https://chromiumcodereview.appspot.com/2441673003
Cr-Commit-Position: refs/heads/master@{#426571}

cc/trees/layer_tree_host_unittest.cc

@@ -287,7 +287,10 @@ class LayerTreeHostTestReadyToActivateNonEmpty
 
 // No single thread test because the commit goes directly to the active tree in
 // single thread mode, so notify ready to activate is skipped.
-REMOTE_AND_MULTI_THREAD_TEST_F(LayerTreeHostTestReadyToActivateNonEmpty);
+// No remote test because we currently don't deserialize FakePictureLayer,
+// so on the impl side, PictureLayerImpl is created instead of
+// FakePictureLayerImpl, see crbug/657871.
+MULTI_THREAD_TEST_F(LayerTreeHostTestReadyToActivateNonEmpty);
 
 // Test if the LTHI receives ReadyToDraw notifications from the TileManager when
 // no raster tasks get scheduled.