Change WGC3DInProcessCBImpl factories to return a base class pointer.

cc/test/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/pixel_test.h"
 
 #include "base/path_service.h"
 #include "base/run_loop.h"
 #include "cc/output/compositor_frame_metadata.h"
 #include "cc/output/copy_output_request.h"
@@ skipping 124 matching lines @@
   return MatchesPNGFile(*result_bitmap_,
                         test_data_dir.Append(ref_file),
                         comparator);
 }
 
 void PixelTest::SetUpGLRenderer(bool use_skia_gpu_backend) {
   CHECK(fake_client_);
   CHECK(gfx::InitializeGLBindings(gfx::kGLImplementationOSMesaGL));
 
   using webkit::gpu::WebGraphicsContext3DInProcessCommandBufferImpl;
-  scoped_ptr<WebGraphicsContext3DInProcessCommandBufferImpl> context3d(
+  scoped_ptr<WebKit::WebGraphicsContext3D> context3d(
       WebGraphicsContext3DInProcessCommandBufferImpl::CreateOffscreenContext(
           WebKit::WebGraphicsContext3D::Attributes()));
   output_surface_.reset(new PixelTestOutputSurface(
       context3d.PassAs<WebKit::WebGraphicsContext3D>()));
   output_surface_->BindToClient(fake_client_.get());
 
   resource_provider_ = ResourceProvider::Create(output_surface_.get(), 0);
   renderer_ = GLRenderer::Create(fake_client_.get(),
                                  output_surface_.get(),
                                  resource_provider_.get(),
@@ skipping 26 matching lines @@
   output_surface_.reset(new PixelTestOutputSurface(device.Pass()));
   output_surface_->BindToClient(fake_client_.get());
   resource_provider_ = ResourceProvider::Create(output_surface_.get(), 0);
   renderer_ = SoftwareRenderer::Create(
       fake_client_.get(),
       output_surface_.get(),
       resource_provider_.get()).PassAs<DirectRenderer>();
 }
 
 }  // namespace cc