cc: Split Proxy to eliminate unnecessary dependencies on the impl side

cc/test/fake_layer_tree_host.h

Index: cc/test/fake_layer_tree_host.h
diff --git a/cc/test/fake_layer_tree_host.h b/cc/test/fake_layer_tree_host.h
index a50219c425f972d66821dcc71735a9f7028f302e..5927dec6bb604d8c440d35c1b9524d98c81e8fa3 100644
--- a/cc/test/fake_layer_tree_host.h
+++ b/cc/test/fake_layer_tree_host.h
@@ -6,7 +6,7 @@
 #define CC_TEST_FAKE_LAYER_TREE_HOST_H_
 
 #include "cc/debug/micro_benchmark_controller.h"
-#include "cc/test/fake_impl_proxy.h"
+#include "cc/test/fake_impl_task_runner_provider.h"
 #include "cc/test/fake_layer_tree_host_client.h"
 #include "cc/test/fake_layer_tree_host_impl.h"
 #include "cc/test/test_shared_bitmap_manager.h"
@@ -59,7 +59,7 @@ class FakeLayerTreeHost : public LayerTreeHost {
                     LayerTreeHost::InitParams* params);
 
  private:
-  FakeImplProxy proxy_;
+  FakeImplTaskRunnerProvider task_runner_provider_;
   FakeLayerTreeHostClient* client_;
   TestSharedBitmapManager manager_;
   FakeLayerTreeHostImpl host_impl_;