Create only one ContextFactory in content unit tests

content/test/test_render_view_host.h

 // 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.
 
 #ifndef CONTENT_TEST_TEST_RENDER_VIEW_HOST_H_
 #define CONTENT_TEST_TEST_RENDER_VIEW_HOST_H_
 
 #include <stdint.h>
 
 #include <string>
 #include <vector>
 
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "build/build_config.h"
+#include "cc/surfaces/surface_id_allocator.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/browser/renderer_host/render_widget_host_view_base.h"
 #include "content/public/common/web_preferences.h"
 #include "content/public/test/mock_render_process_host.h"
 #include "content/public/test/test_renderer_host.h"
 #include "ui/base/ime/dummy_text_input_client.h"
 #include "ui/base/layout.h"
 #include "ui/base/page_transition_types.h"
 #include "ui/gfx/geometry/vector2d_f.h"
 
@@ skipping 106 matching lines @@
   uint32_t GetSurfaceIdNamespace() override;
 
   bool is_showing() const { return is_showing_; }
   bool is_occluded() const { return is_occluded_; }
   bool did_swap_compositor_frame() const { return did_swap_compositor_frame_; }
 
  protected:
   RenderWidgetHostImpl* rwh_;
 
  private:
-  uint32_t surface_id_namespace_;
+  std::unique_ptr<cc::SurfaceIdAllocator> surface_id_allocator_;
   bool is_showing_;
   bool is_occluded_;
   bool did_swap_compositor_frame_;
   ui::DummyTextInputClient text_input_client_;
 };
 
 #if defined(COMPILER_MSVC)
 // See comment for same warning on RenderViewHostImpl.
 #pragma warning(push)
 #pragma warning(disable: 4250)
@@ skipping 156 matching lines @@
  private:
   typedef std::unique_ptr<ui::test::ScopedSetSupportedScaleFactors>
       ScopedSetSupportedScaleFactors;
   ScopedSetSupportedScaleFactors scoped_set_supported_scale_factors_;
   DISALLOW_COPY_AND_ASSIGN(RenderViewHostImplTestHarness);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_TEST_TEST_RENDER_VIEW_HOST_H_