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

ash/launcher/launcher_button.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 "ash/launcher/launcher_button.h"
 
 #include <algorithm>
 
 #include "ash/launcher/launcher_button_host.h"
 #include "ash/shelf/shelf_layout_manager.h"
@@ skipping 78 matching lines @@
 
   ui::ThrobAnimation& GetThrobAnimation() {
     if (!animation_.is_animating()) {
       animation_.Reset();
       animation_.StartThrobbing(-1 /*throb indefinitely*/);
     }
     return animation_;
   }
 
   // ui::AnimationDelegate
-  void AnimationProgressed(const ui::Animation* animation) {
+  virtual void AnimationProgressed(const ui::Animation* animation) OVERRIDE {
     if (animation != &animation_)
       return;
     if (!animation_.is_animating())
       return;
     FOR_EACH_OBSERVER(Observer, observers_, AnimationProgressed());
   }
 
   ui::ThrobAnimation animation_;
   ObserverList<Observer> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(LauncherButtonAnimation);
 };
 
 }  // namespace
 
 namespace ash {
 namespace internal {
 
 ////////////////////////////////////////////////////////////////////////////////
 // LauncherButton::BarView
 
 class LauncherButton::BarView : public views::ImageView,
                                 public LauncherButtonAnimation::Observer {
  public:
   BarView(LauncherButton* host)
       : host_(host),
         show_attention_(false) {
   }
 
-  ~BarView() {
+  virtual ~BarView() {
     if (show_attention_)
       LauncherButtonAnimation::GetInstance()->RemoveObserver(this);
   }
 
   // View
   virtual bool HitTestRect(const gfx::Rect& rect) const OVERRIDE {
     // Allow Mouse...() messages to go to the parent view.
     return false;
   }
 
@@ skipping 380 matching lines @@
           views::ImageView::TRAILING,
           views::ImageView::CENTER,
           views::ImageView::CENTER,
           views::ImageView::LEADING));
   bar_->SchedulePaint();
   SchedulePaint();
 }
 
 }  // namespace internal
 }  // namespace ash