aura: Remove CreateOffscreenContext from ui::ContextFactory.

cc/test/test_web_graphics_context_3d.h

 // Copyright 2011 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.
 
 #ifndef CC_TEST_TEST_WEB_GRAPHICS_CONTEXT_3D_H_
 #define CC_TEST_TEST_WEB_GRAPHICS_CONTEXT_3D_H_
 
 #include <vector>
 
+#include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/containers/hash_tables.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/stl_util.h"
 #include "base/synchronization/lock.h"
 #include "cc/base/scoped_ptr_hash_map.h"
 #include "cc/debug/fake_web_graphics_context_3d.h"
 #include "third_party/khronos/GLES2/gl2.h"
 
-namespace WebKit { struct WebGraphicsMemoryAllocation; }
+namespace WebKit {
+class WebGraphicsContext3D;
+struct WebGraphicsMemoryAllocation;
+}
 
 namespace cc {
 
 class TestWebGraphicsContext3D : public FakeWebGraphicsContext3D {
  public:
-  static scoped_ptr<TestWebGraphicsContext3D> Create() {
-    return make_scoped_ptr(new TestWebGraphicsContext3D());
-  }
-  static scoped_ptr<TestWebGraphicsContext3D> Create(
-      const WebKit::WebGraphicsContext3D::Attributes& attributes) {
-    return make_scoped_ptr(new TestWebGraphicsContext3D(attributes));
-  }
+  static scoped_ptr<TestWebGraphicsContext3D> Create();
+  static base::Callback<
+    scoped_ptr<TestWebGraphicsContext3D>()> CreateFactory();
+  static base::Callback<
+    scoped_ptr<WebKit::WebGraphicsContext3D>()> CreateBaseFactory();
+
   virtual ~TestWebGraphicsContext3D();
 
   virtual bool makeContextCurrent();
 
   virtual int width();
   virtual int height();
 
   virtual void reshapeWithScaleFactor(
       int width, int height, float scale_factor);
 
@@ skipping 241 matching lines @@
 
   scoped_refptr<Namespace> namespace_;
   static Namespace* shared_namespace_;
 
   base::WeakPtrFactory<TestWebGraphicsContext3D> weak_ptr_factory_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_TEST_WEB_GRAPHICS_CONTEXT_3D_H_