Change WGC3DInProcessCBImpl factories to return a base class pointer.

cc/test/layer_tree_pixel_test.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/layer_tree_pixel_test.h"
 
 #include "base/path_service.h"
 #include "cc/output/copy_output_request.h"
 #include "cc/test/paths.h"
 #include "cc/test/pixel_comparator.h"
 #include "cc/test/pixel_test_utils.h"
 #include "cc/trees/layer_tree_impl.h"
 #include "ui/gl/gl_implementation.h"
 #include "webkit/common/gpu/context_provider_in_process.h"
 #include "webkit/common/gpu/webgraphicscontext3d_in_process_command_buffer_impl.h"
 
 namespace cc {
 
 LayerTreePixelTest::LayerTreePixelTest()
     : pixel_comparator_(new ExactPixelComparator(true)) {}
 
 LayerTreePixelTest::~LayerTreePixelTest() {}
 
 scoped_ptr<OutputSurface> LayerTreePixelTest::CreateOutputSurface() {
   CHECK(gfx::InitializeGLBindings(gfx::kGLImplementationOSMesaGL));
 
   using webkit::gpu::WebGraphicsContext3DInProcessCommandBufferImpl;
-  scoped_ptr<WebGraphicsContext3DInProcessCommandBufferImpl> context3d(
+  scoped_ptr<WebKit::WebGraphicsContext3D> context3d(
       WebGraphicsContext3DInProcessCommandBufferImpl::CreateOffscreenContext(
           WebKit::WebGraphicsContext3D::Attributes()));
   return make_scoped_ptr(
       new OutputSurface(context3d.PassAs<WebKit::WebGraphicsContext3D>()));
 }
 
 scoped_refptr<cc::ContextProvider>
 LayerTreePixelTest::OffscreenContextProviderForMainThread() {
   scoped_refptr<webkit::gpu::ContextProviderInProcess> provider =
       webkit::gpu::ContextProviderInProcess::Create();
@@ skipping 95 matching lines @@
 
 void LayerTreePixelTest::SetupTree() {
   scoped_refptr<Layer> root = Layer::Create();
   root->SetBounds(content_root_->bounds());
   root->AddChild(content_root_);
   layer_tree_host()->SetRootLayer(root);
   LayerTreeTest::SetupTree();
 }
 
 }  // namespace cc