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

ui/views/corewm/focus_controller_unittest.cc

 // 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.
 
 #include "ui/views/corewm/focus_controller.h"
 
 #include <map>
 
 #include "ui/aura/client/activation_change_observer.h"
 #include "ui/aura/client/activation_client.h"
@@ skipping 529 matching lines @@
     ActivateWindowById(1);
     EXPECT_EQ(1, GetFocusedWindowId());
 
     client->RemoveObserver(observer.get());
 
     ActivateWindowById(2);
     EXPECT_EQ(2, GetFocusedWindowId());
     ActivateWindowById(1);
     EXPECT_EQ(1, GetFocusedWindowId());
   }
-  virtual void ShiftFocusOnActivationDueToHide() {
+  virtual void ShiftFocusOnActivationDueToHide() OVERRIDE {
     // Similar to ShiftFocusOnActivation except the activation change is
     // triggered by hiding the active window.
     ActivateWindowById(1);
     EXPECT_EQ(1, GetFocusedWindowId());
 
     // Removes window 3 as candidate for next activatable window.
     root_window()->GetChildById(3)->Hide();
     EXPECT_EQ(1, GetFocusedWindowId());
 
     aura::Window* target = root_window()->GetChildById(2);
@@ skipping 430 matching lines @@
 //   activation change observer are ignored.
 DIRECT_FOCUS_CHANGE_TESTS(ShiftFocusOnActivation);
 DIRECT_FOCUS_CHANGE_TESTS(ShiftFocusOnActivationDueToHide);
 DIRECT_FOCUS_CHANGE_TESTS(NoShiftActiveOnActivation);
 
 // Clicking on a window which has capture should not result in a focus change.
 DIRECT_FOCUS_CHANGE_TESTS(NoFocusChangeOnClickOnCaptureWindow);
 
 }  // namespace corewm
 }  // namespace views