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 2235b420773a079d78391720dde7b1e74cfda7f3..b18a127efd133b5f0770ff9d1701061e47b8b1c0 100644
--- a/cc/layer_unittest.cc
+++ b/cc/layer_unittest.cc
@@ -41,7 +41,7 @@ public:
     MockLayerImplTreeHost()
         : LayerTreeHost(&m_fakeClient, LayerTreeSettings())
     {
-        initialize();
+        initialize(0);
     }
 
     MOCK_METHOD0(setNeedsCommit, void());
@@ -520,8 +520,6 @@ TEST_F(LayerTest, checkPropertyChangeCausesCorrectBehavior)
 
 TEST_F(LayerTest, verifyPushPropertiesAccumulatesUpdateRect)
 {
-    DebugScopedSetImplThread setImplThread;
-
     scoped_refptr<Layer> testLayer = Layer::create();
     scoped_ptr<LayerImpl> implLayer = LayerImpl::create(1);
 
@@ -596,7 +594,7 @@ 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(0);
         return host.Pass();
     }