Remove GetSharedMainThreadContextProvider from CompositorDependencies.

content/renderer/gpu/compositor_dependencies.h

 // Copyright 2014 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_RENDERER_GPU_COMPOSITOR_DEPENDENCIES_H_
 #define CONTENT_RENDERER_GPU_COMPOSITOR_DEPENDENCIES_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 35 matching lines @@
   virtual std::vector<unsigned> GetImageTextureTargets() = 0;
   virtual scoped_refptr<base::SingleThreadTaskRunner>
   GetCompositorMainThreadTaskRunner() = 0;
   // Returns null if the compositor is in single-threaded mode (ie. there is no
   // compositor thread).
   virtual scoped_refptr<base::SingleThreadTaskRunner>
   GetCompositorImplThreadTaskRunner() = 0;
   virtual cc::SharedBitmapManager* GetSharedBitmapManager() = 0;
   virtual gpu::GpuMemoryBufferManager* GetGpuMemoryBufferManager() = 0;
   virtual scheduler::RendererScheduler* GetRendererScheduler() = 0;
-  virtual cc::ContextProvider* GetSharedMainThreadContextProvider() = 0;
   virtual std::unique_ptr<cc::BeginFrameSource> CreateExternalBeginFrameSource(
       int routing_id) = 0;
   virtual cc::ImageSerializationProcessor* GetImageSerializationProcessor() = 0;
   virtual cc::TaskGraphRunner* GetTaskGraphRunner() = 0;
   virtual bool AreImageDecodeTasksEnabled() = 0;
   virtual bool IsThreadedAnimationEnabled() = 0;
 
   virtual ~CompositorDependencies() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_GPU_COMPOSITOR_DEPENDENCIES_H_