Change WGC3DInProcessCBImpl factories to return a base class pointer.

webkit/common/gpu/context_provider_in_process.cc

 // Copyright (c) 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 "webkit/common/gpu/context_provider_in_process.h"
 
 #include "webkit/common/gpu/grcontext_for_webgraphicscontext3d.h"
+#include "webkit/common/gpu/webgraphicscontext3d_in_process_command_buffer_impl.h"
 
 namespace webkit {
 namespace gpu {
 
 class ContextProviderInProcess::LostContextCallbackProxy
     : public WebKit::WebGraphicsContext3D::WebGraphicsContextLostCallback {
  public:
   explicit LostContextCallbackProxy(ContextProviderInProcess* provider)
       : provider_(provider) {
     provider_->context3d_->setContextLostCallback(this);
@@ skipping 107 matching lines @@
 }
 
 void ContextProviderInProcess::OnMemoryAllocationChanged(
     bool nonzero_allocation) {
   if (gr_context_)
     gr_context_->SetMemoryLimit(nonzero_allocation);
 }
 
 }  // namespace gpu
 }  // namespace webkit