Remove GetSharedMainThreadContextProvider from CompositorDependencies.

content/test/fake_compositor_dependencies.cc

 // 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.
 
 #include "content/test/fake_compositor_dependencies.h"
 
 #include <stddef.h>
 
 #include "base/memory/ptr_util.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 67 matching lines @@
 gpu::GpuMemoryBufferManager*
 FakeCompositorDependencies::GetGpuMemoryBufferManager() {
   return &gpu_memory_buffer_manager_;
 }
 
 scheduler::RendererScheduler*
 FakeCompositorDependencies::GetRendererScheduler() {
   return &renderer_scheduler_;
 }
 
-cc::ContextProvider*
-FakeCompositorDependencies::GetSharedMainThreadContextProvider() {
-  NOTREACHED();
-  return nullptr;
-}
-
 std::unique_ptr<cc::BeginFrameSource>
 FakeCompositorDependencies::CreateExternalBeginFrameSource(int routing_id) {
   double refresh_rate = 200.0;
   return base::WrapUnique(new cc::FakeExternalBeginFrameSource(refresh_rate));
 }
 
 cc::ImageSerializationProcessor*
 FakeCompositorDependencies::GetImageSerializationProcessor() {
   return nullptr;
 }
 
 cc::TaskGraphRunner* FakeCompositorDependencies::GetTaskGraphRunner() {
   return &task_graph_runner_;
 }
 
 bool FakeCompositorDependencies::AreImageDecodeTasksEnabled() {
   return false;
 }
 
 bool FakeCompositorDependencies::IsThreadedAnimationEnabled() {
   return true;
 }
 
 }  // namespace content