Remove WebGraphicsContext3D getter from cc::ContextProvider

cc/test/test_in_process_context_provider.cc

 // Copyright 2013 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 "cc/test/test_in_process_context_provider.h"
 
 #include "base/lazy_instance.h"
 #include "gpu/GLES2/gl2extchromium.h"
 #include "gpu/command_buffer/client/gl_in_process_context.h"
 #include "gpu/command_buffer/client/gles2_implementation.h"
@@ skipping 37 matching lines @@
 TestInProcessContextProvider::TestInProcessContextProvider()
     : context_(CreateTestInProcessContext()) {}
 
 TestInProcessContextProvider::~TestInProcessContextProvider() {
   if (gr_context_)
     gr_context_->contextDestroyed();
 }
 
 bool TestInProcessContextProvider::BindToCurrentThread() { return true; }
 
-blink::WebGraphicsContext3D* TestInProcessContextProvider::Context3d() {
-  return NULL;
-}
-
 gpu::gles2::GLES2Interface* TestInProcessContextProvider::ContextGL() {
   return context_->GetImplementation();
 }
 
 gpu::ContextSupport* TestInProcessContextProvider::ContextSupport() {
   return context_->GetImplementation();
 }
 
 static void BindGrContextCallback(const GrGLInterface* interface) {
 #if GR_GL_PER_GL_FUNC_CALLBACK
@@ skipping 55 matching lines @@
 
 bool TestInProcessContextProvider::DestroyedOnMainThread() { return false; }
 
 void TestInProcessContextProvider::SetLostContextCallback(
     const LostContextCallback& lost_context_callback) {}
 
 void TestInProcessContextProvider::SetMemoryPolicyChangedCallback(
     const MemoryPolicyChangedCallback& memory_policy_changed_callback) {}
 
 }  // namespace cc