cc: Remove cc::Thread and cc::ThreadImpl.

cc/layers/texture_layer_unittest.cc

Index: cc/layers/texture_layer_unittest.cc
diff --git a/cc/layers/texture_layer_unittest.cc b/cc/layers/texture_layer_unittest.cc
index d6201fadb052ea23e9c88ff5640eb63c3bd311d3..ee4f4699312854b4461755b32f1176a93b857a74 100644
--- a/cc/layers/texture_layer_unittest.cc
+++ b/cc/layers/texture_layer_unittest.cc
@@ -7,7 +7,6 @@
 #include <string>
 
 #include "base/callback.h"
-#include "cc/base/thread.h"
 #include "cc/layers/texture_layer_client.h"
 #include "cc/layers/texture_layer_impl.h"
 #include "cc/test/fake_impl_proxy.h"
@@ -33,7 +32,7 @@ class MockLayerTreeHost : public LayerTreeHost {
  public:
   explicit MockLayerTreeHost(LayerTreeHostClient* client)
       : LayerTreeHost(client, LayerTreeSettings()) {
-    Initialize(scoped_ptr<Thread>());
+    Initialize(NULL);
   }
 
   MOCK_METHOD0(AcquireLayerTextures, void());