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

chrome/browser/ui/views/bookmarks/bookmark_bar_view_test.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 "base/bind.h"
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/prefs/pref_service.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/utf_string_conversions.h"
@@ skipping 1696 matching lines @@
 // The opened context menu should behave as it is from the folder button.
 class BookmarkBarViewTest21 : public BookmarkBarViewEventTestBase {
  public:
   BookmarkBarViewTest21()
       : observer_(CreateEventTask(this, &BookmarkBarViewTest21::Step3)) {
   }
 
  protected:
   // Move the mouse to the empty folder on the bookmark bar and press the
   // left mouse button.
-  virtual void DoTestOnMessageLoop() {
+  virtual void DoTestOnMessageLoop() OVERRIDE {
     views::TextButton* button = GetBookmarkButton(5);
     ui_test_utils::MoveMouseToCenterAndPress(button, ui_controls::LEFT,
         ui_controls::DOWN | ui_controls::UP,
         CreateEventTask(this, &BookmarkBarViewTest21::Step2));
   }
 
  private:
   // Confirm that a menu for empty folder shows and right click the menu.
   void Step2() {
     // Menu should be showing.
@@ skipping 40 matching lines @@
     EXPECT_TRUE(bb_view_->GetContextMenu() == NULL);
     EXPECT_TRUE(bb_view_->GetMenu() == NULL);
 
     Done();
   }
 
   ContextMenuNotificationObserver observer_;
 };
 
 VIEW_TEST(BookmarkBarViewTest21, ContextMenusForEmptyFolder)