Remove static thread pointers from CC

cc/layer_unittest.cc

Index: cc/layer_unittest.cc
diff --git a/cc/layer_unittest.cc b/cc/layer_unittest.cc
index 33f37e7d329b814e24c7cb390f16dc003bdd10cb..01c7501cd61366c0ea77a9c81180d6106b00c252 100644
--- a/cc/layer_unittest.cc
+++ b/cc/layer_unittest.cc
@@ -40,7 +40,7 @@ public:
     MockLayerImplTreeHost()
         : LayerTreeHost(&m_fakeClient, LayerTreeSettings())
     {
-        initialize();
+        initialize(NULL);
     }
 
     MOCK_METHOD0(setNeedsCommit, void());
@@ -528,8 +528,6 @@ TEST_F(LayerTest, checkPropertyChangeCausesCorrectBehavior)
 
 TEST_F(LayerTest, verifyPushPropertiesAccumulatesUpdateRect)
 {
-    DebugScopedSetImplThread setImplThread;
-
     scoped_refptr<Layer> testLayer = Layer::create();
     scoped_ptr<LayerImpl> implLayer = LayerImpl::create(1);
 
@@ -605,7 +603,7 @@ public:
     {
         scoped_ptr<FakeLayerImplTreeHost> host(new FakeLayerImplTreeHost);
         // The initialize call will fail, since our client doesn't provide a valid GraphicsContext3D, but it doesn't matter in the tests that use this fake so ignore the return value.
-        host->initialize();
+        host->initialize(NULL);
         return host.Pass();
     }