Remove the TestContextFactory, always use NullDraw GL for unit tests.

ui/compositor/test/test_context_factory.h

-// 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.
-
-#ifndef UI_COMPOSITOR_TEST_TEST_CONTEXT_FACTORY_H_
-#define UI_COMPOSITOR_TEST_TEST_CONTEXT_FACTORY_H_
-
-#include "ui/compositor/compositor.h"
-
-namespace cc { class TestContextProvider; }
-
-namespace ui {
-
-// The factory that creates test contexts.
-class TestContextFactory : public ContextFactory {
- public:
-  TestContextFactory();
-  virtual ~TestContextFactory();
-
-  // ContextFactory implementation
-  virtual scoped_ptr<cc::OutputSurface> CreateOutputSurface(
-      Compositor* compositor, bool software_fallback) OVERRIDE;
-
-  virtual scoped_refptr<Reflector> CreateReflector(
-      Compositor* mirrored_compositor,
-      Layer* mirroring_layer) OVERRIDE;
-  virtual void RemoveReflector(scoped_refptr<Reflector> reflector) OVERRIDE;
-
-  virtual scoped_refptr<cc::ContextProvider>
-      OffscreenCompositorContextProvider() OVERRIDE;
-  virtual scoped_refptr<cc::ContextProvider>
-      SharedMainThreadContextProvider() OVERRIDE;
-  virtual void RemoveCompositor(Compositor* compositor) OVERRIDE;
-  virtual bool DoesCreateTestContexts() OVERRIDE;
-
- private:
-  scoped_refptr<cc::TestContextProvider> offscreen_compositor_contexts_;
-  scoped_refptr<cc::TestContextProvider> shared_main_thread_contexts_;
-
-  DISALLOW_COPY_AND_ASSIGN(TestContextFactory);
-};
-
-}  // namespace ui
-
-#endif  // UI_COMPOSITOR_TEST_TEST_CONTEXT_FACTORY_H_