[EXPERIMENT] Revert "Route D3D VSync signal to Compositor"

content/browser/compositor/gpu_vsync_begin_frame_source.h

Index: content/browser/compositor/gpu_vsync_begin_frame_source.h
diff --git a/content/browser/compositor/gpu_vsync_begin_frame_source.h b/content/browser/compositor/gpu_vsync_begin_frame_source.h
deleted file mode 100644
index a701f98433f420d3b405aeaa65ef4a4ddaf3bfa6..0000000000000000000000000000000000000000
--- a/content/browser/compositor/gpu_vsync_begin_frame_source.h
+++ /dev/null
@@ -1,44 +0,0 @@
-// Copyright 2016 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 CONTENT_BROWSER_COMPOSITOR_GPU_VSYNC_BEGIN_FRAME_SOURCE_H_
-#define CONTENT_BROWSER_COMPOSITOR_GPU_VSYNC_BEGIN_FRAME_SOURCE_H_
-
-#include "base/memory/weak_ptr.h"
-#include "base/time/time.h"
-#include "cc/scheduler/begin_frame_source.h"
-
-namespace content {
-
-// This class is used to control VSync production on GPU side.
-class GpuVSyncControl {
- public:
-  virtual void SetNeedsVSync(bool needs_vsync) = 0;
-};
-
-// This is a type of ExternalBeginFrameSource where VSync signals are
-// generated externally on GPU side.
-class GpuVSyncBeginFrameSource : public cc::ExternalBeginFrameSource,
-                                 cc::ExternalBeginFrameSourceClient {
- public:
-  explicit GpuVSyncBeginFrameSource(GpuVSyncControl* vsync_control);
-  ~GpuVSyncBeginFrameSource() override;
-
-  // cc::ExternalBeginFrameSourceClient implementation.
-  void OnNeedsBeginFrames(bool needs_begin_frames) override;
-  void OnDidFinishFrame(const cc::BeginFrameAck& ack) override;
-
-  void OnVSync(base::TimeTicks timestamp, base::TimeDelta interval);
-
- private:
-  GpuVSyncControl* const vsync_control_;
-  bool needs_begin_frames_;
-  uint64_t next_sequence_number_;
-
-  DISALLOW_COPY_AND_ASSIGN(GpuVSyncBeginFrameSource);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_COMPOSITOR_GPU_VSYNC_BEGIN_FRAME_SOURCE_H_