Revert "Replaced blink sync points with new sync tokens."

gpu/blink/webgraphicscontext3d_impl.h

 // Copyright (c) 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 GPU_BLINK_WEBGRAPHICSCONTEXT3D_IMPL_H_
 #define GPU_BLINK_WEBGRAPHICSCONTEXT3D_IMPL_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 19 matching lines @@
 class GPU_BLINK_EXPORT WebGraphicsContext3DImpl
     : public NON_EXPORTED_BASE(blink::WebGraphicsContext3D) {
  public:
   ~WebGraphicsContext3DImpl() override;
 
   //----------------------------------------------------------------------
   // WebGraphicsContext3D methods
 
   uint32_t lastFlushID() override;
 
-  blink::WGC3Duint64 insertFenceSyncCHROMIUM() override;
-  bool genSyncTokenCHROMIUM(blink::WGC3Duint64 fenceSync,
-                            blink::WGC3Dbyte* syncToken) override;
-  void waitSyncTokenCHROMIUM(const blink::WGC3Dbyte* syncToken) override;
+  bool insertSyncPoint(blink::WGC3Dbyte* sync_token) override;
+  void waitSyncToken(const blink::WGC3Dbyte* sync_token) override;
 
   void loseContextCHROMIUM(blink::WGC3Denum current,
                            blink::WGC3Denum other) override;
 
   void reshapeWithScaleFactor(
       int width, int height, float scale_factor) override;
 
   void prepareTexture() override;
   void postSubBufferCHROMIUM(int x, int y, int width, int height) override;
 
@@ skipping 917 matching lines @@
   std::vector<blink::WGC3Denum> synthetic_errors_;
 
   ::gpu::gles2::GLES2Interface* gl_;
   bool lose_context_when_out_of_memory_;
   uint32_t flush_id_;
 };
 
 }  // namespace gpu_blink
 
 #endif  // GPU_BLINK_WEBGRAPHICSCONTEXT3D_IMPL_H_