Warn on missing OVERRIDE/virtual everywhere, not just in header files.

ui/message_center/views/message_center_view_unittest.cc

Index: ui/message_center/views/message_center_view_unittest.cc
diff --git a/ui/message_center/views/message_center_view_unittest.cc b/ui/message_center/views/message_center_view_unittest.cc
index 128b9b7e40aaafa013f8de570af41e02170811fc..84ac652f9b7ba1188100e7db9ace888253d11c25 100644
--- a/ui/message_center/views/message_center_view_unittest.cc
+++ b/ui/message_center/views/message_center_view_unittest.cc
@@ -40,9 +40,9 @@ class MockNotificationView : public NotificationView {
                                 int view_id);
   virtual ~MockNotificationView();
 
-  virtual gfx::Size GetPreferredSize();
-  virtual int GetHeightForWidth(int w);
-  virtual void Layout();
+  virtual gfx::Size GetPreferredSize() OVERRIDE;
+  virtual int GetHeightForWidth(int w) OVERRIDE;
+  virtual void Layout() OVERRIDE;
 
   int get_id() { return id_; };
 
@@ -104,7 +104,7 @@ class MessageCenterViewTest : public testing::Test,
   int GetNotificationCount();
   int GetCallCount(CallType type);
 
-  void RegisterCall(int receiver_id, CallType type);
+  virtual void RegisterCall(int receiver_id, CallType type) OVERRIDE;
 
   void LogBounds(int depth, views::View* view);