cc: Get rid of PostSwapBuffersComplete.

cc/test/fake_compositor_frame_sink.h

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_TEST_FAKE_COMPOSITOR_FRAME_SINK_H_
 #define CC_TEST_FAKE_COMPOSITOR_FRAME_SINK_H_
 
 #include <stddef.h>
 
 #include "base/callback.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
+#include "base/memory/weak_ptr.h"
 #include "base/time/time.h"
 #include "cc/output/begin_frame_args.h"
 #include "cc/output/compositor_frame.h"
 #include "cc/output/compositor_frame_sink.h"
 #include "cc/output/software_output_device.h"
 #include "cc/test/test_context_provider.h"
 #include "cc/test/test_gles2_interface.h"
 #include "cc/test/test_web_graphics_context_3d.h"
 
 namespace cc {
@@ skipping 48 matching lines @@
   FakeCompositorFrameSink(
       scoped_refptr<ContextProvider> context_provider,
       scoped_refptr<ContextProvider> worker_context_provider);
 
   CompositorFrameSinkClient* client_ = nullptr;
   std::unique_ptr<CompositorFrame> last_sent_frame_;
   size_t num_sent_frames_ = 0;
   TransferableResourceArray resources_held_by_parent_;
   bool last_swap_rect_valid_ = false;
   gfx::Rect last_swap_rect_;
+
+ private:
+  void SwapBuffersAck();
+
+  base::WeakPtrFactory<FakeCompositorFrameSink> weak_ptr_factory_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_FAKE_COMPOSITOR_FRAME_SINK_H_