base: Do not allow MessagePumpObservers to consume events.

base/message_loop/message_pump_x11.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.
 
 #ifndef BASE_MESSAGE_LOOP_MESSAGE_PUMP_X11_H
 #define BASE_MESSAGE_LOOP_MESSAGE_PUMP_X11_H
 
 #include <bitset>
 #include <map>
 
@@ skipping 31 matching lines @@
   // Returns the UI or GPU message pump.
   static MessagePumpX11* Current();
 
   // Adds an Observer, which will start receiving notifications immediately.
   void AddObserver(MessagePumpObserver* observer);
 
   // Removes an Observer.  It is safe to call this method while an Observer is
   // receiving a notification callback.
   void RemoveObserver(MessagePumpObserver* observer);
 
-  // Sends the event to the observers. If an observer returns true, then it does
-  // not send the event to any other observers and returns true. Returns false
-  // if no observer returns true.
-  bool WillProcessXEvent(XEvent* xevent);
+  // Sends the event to the observers.
+  void WillProcessXEvent(XEvent* xevent);
   void DidProcessXEvent(XEvent* xevent);
 
  private:
   // List of observers.
   ObserverList<MessagePumpObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(MessagePumpX11);
 };
 
 #if !defined(TOOLKIT_GTK)
 typedef MessagePumpX11 MessagePumpForUI;
 #endif
 
 }  // namespace base
 
 #endif  // BASE_MESSAGE_LOOP_MESSAGE_PUMP_X11_H