Change WGC3DInProcessCBImpl factories to return a base class pointer.

ui/aura/bench/bench_main.cc

 // Copyright (c) 2012 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 "base/at_exit.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/i18n/icu_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 189 matching lines @@
       }
     }
     if (!width || !height) {
       width = 800;
       height = 600;
     }
     gfx::Rect bounds(width, height);
     webgl_.SetBounds(bounds);
     parent_->Add(&webgl_);
 
-    context_.reset(ui::ContextFactory::GetInstance()->CreateOffscreenContext());
+    context_ = ui::ContextFactory::GetInstance()->CreateOffscreenContext();
     context_->makeContextCurrent();
     texture_ = new WebGLTexture(context_.get(), bounds.size());
     fbo_ = context_->createFramebuffer();
     compositor->AddObserver(this);
     webgl_.SetExternalTexture(texture_.get());
     context_->bindFramebuffer(GL_FRAMEBUFFER, fbo_);
     context_->framebufferTexture2D(
         GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
         GL_TEXTURE_2D, texture_->PrepareTexture(), 0);
     context_->clearColor(0.f, 1.f, 0.f, 1.f);
@@ skipping 133 matching lines @@
   ui::PrintLayerHierarchy(root_window->layer(), gfx::Point(100, 100));
 #endif
 
   root_window->ShowRootWindow();
   base::MessageLoopForUI::current()->Run();
   focus_client.reset();
   root_window.reset();
 
   return 0;
 }