MockWindowObserver  974 content/browser/renderer_host/render_widget_host_view_aura_unittest.cc   MockWindowObserver observer;
MockWindowObserver 1058 content/browser/renderer_host/render_widget_host_view_aura_unittest.cc   MockWindowObserver observer;
MockWindowObserver 1131 content/browser/renderer_host/render_widget_host_view_aura_unittest.cc   MockWindowObserver observer;