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 68 matching lines @@
 
  private:
   typedef std::map<unsigned long, MessagePumpDispatcher*> DispatchersMap;
 
   // Initializes the glib event source for X.
   void InitXSource();
 
   // Dispatches the event to the specified dispatcher.
   void ProcessXEvent(MessagePumpDispatcher* dispatcher, XEvent* event);
 
-  // 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);
 
   // Returns the Dispatcher based on the event's target window.
   MessagePumpDispatcher* GetDispatcherForXEvent(const NativeEvent& xev) const;
 
   ObserverList<MessagePumpObserver>& observers() { return observers_; }
 
   // Overridden from MessagePumpDispatcher:
   virtual uint32_t Dispatch(const NativeEvent& event) OVERRIDE;
 
@@ skipping 18 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(MessagePumpX11);
 };
 
 #if !defined(TOOLKIT_GTK)
 typedef MessagePumpX11 MessagePumpForUI;
 #endif
 
 }  // namespace base
 
 #endif  // BASE_MESSAGE_LOOP_MESSAGE_PUMP_X11_H