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

chrome/browser/ui/views/frame/immersive_mode_controller_ash.cc

 // Copyright 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 "chrome/browser/ui/views/frame/immersive_mode_controller_ash.h"
 
 #include "ash/ash_switches.h"
 #include "ash/shell.h"
 #include "ash/wm/window_properties.h"
 #include "base/command_line.h"
@@ skipping 74 matching lines @@
 
 class RevealedLockAsh : public ImmersiveRevealedLock {
  public:
   RevealedLockAsh(const base::WeakPtr<ImmersiveModeControllerAsh>& controller,
                   ImmersiveModeController::AnimateReveal animate_reveal)
       : controller_(controller) {
     DCHECK(controller_);
     controller_->LockRevealedState(animate_reveal);
   }
 
-  ~RevealedLockAsh() {
+  virtual ~RevealedLockAsh() {
     if (controller_)
       controller_->UnlockRevealedState();
   }
 
  private:
   base::WeakPtr<ImmersiveModeControllerAsh> controller_;
 
   DISALLOW_COPY_AND_ASSIGN(RevealedLockAsh);
 };
 
@@ skipping 807 matching lines @@
   ui::ScopedLayerAnimationSettings settings(layer->GetAnimator());
   settings.SetTweenType(ui::Tween::EASE_OUT);
   settings.SetTransitionDuration(
       base::TimeDelta::FromMilliseconds(duration_ms));
   settings.SetPreemptionStrategy(
       ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
   if (observer)
     settings.AddObserver(observer);
   layer->SetTransform(target_transform);
 }