base: Do not allow MessagePumpObservers to consume events.

chrome/browser/notifications/balloon_collection_impl.h

 // 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.
 
 // Handles the visible notification (or balloons).
 
 #ifndef CHROME_BROWSER_NOTIFICATIONS_BALLOON_COLLECTION_IMPL_H_
 #define CHROME_BROWSER_NOTIFICATIONS_BALLOON_COLLECTION_IMPL_H_
 
 #include <deque>
@@ skipping 47 matching lines @@
   virtual void OnBalloonClosed(Balloon* source) OVERRIDE;
   virtual const Balloons& GetActiveBalloons() OVERRIDE;
 
   // content::NotificationObserver interface.
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   // MessageLoopForUI::Observer interface.
 #if defined(OS_WIN) || defined(USE_AURA)
-  virtual base::EventStatus WillProcessEvent(
-      const base::NativeEvent& event) OVERRIDE;
+  virtual void WillProcessEvent(const base::NativeEvent& event) OVERRIDE;
   virtual void DidProcessEvent(const base::NativeEvent& event) OVERRIDE;
 #elif defined(TOOLKIT_GTK)
   virtual void WillProcessEvent(GdkEvent* event) OVERRIDE;
   virtual void DidProcessEvent(GdkEvent* event) OVERRIDE;
 #endif
 
   // base_ is embedded, so this is a simple accessor for the number of
   // balloons in the collection.
   int count() const { return base_.count(); }
 
@@ skipping 159 matching lines @@
   base::WeakPtrFactory<BalloonCollectionImpl> reposition_factory_;
 
   // Is the balloon collection currently listening for UI events?
   bool added_as_message_loop_observer_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(BalloonCollectionImpl);
 };
 
 #endif  // CHROME_BROWSER_NOTIFICATIONS_BALLOON_COLLECTION_IMPL_H_