base: Do not allow MessagePumpObservers to consume events.

chrome/browser/chromeos/events/xinput_hierarchy_changed_event_listener.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 "chrome/browser/chromeos/events/xinput_hierarchy_changed_event_listener.h"
 
 #include <X11/extensions/XInput2.h>
 #include <X11/Xlib.h>
 
 #include "chromeos/ime/input_method_manager.h"
@@ skipping 64 matching lines @@
 void XInputHierarchyChangedEventListener::AddObserver(
     DeviceHierarchyObserver* observer) {
   observer_list_.AddObserver(observer);
 }
 
 void XInputHierarchyChangedEventListener::RemoveObserver(
     DeviceHierarchyObserver* observer) {
   observer_list_.RemoveObserver(observer);
 }
 
-base::EventStatus XInputHierarchyChangedEventListener::WillProcessEvent(
+void XInputHierarchyChangedEventListener::WillProcessEvent(
     const base::NativeEvent& event) {
-  // There may be multiple listeners for the XI_HierarchyChanged event. So
-  // always return EVENT_CONTINUE to make sure all the listeners receive the
-  // event.
   ProcessedXEvent(event);
-  return base::EVENT_CONTINUE;
 }
 
 void XInputHierarchyChangedEventListener::DidProcessEvent(
     const base::NativeEvent& event) {
 }
 
 void XInputHierarchyChangedEventListener::ProcessedXEvent(XEvent* xevent) {
   if (xevent->xcookie.type != GenericEvent)
     return;
 
   XGenericEventCookie* cookie = &(xevent->xcookie);
 
   if (cookie->evtype == XI_HierarchyChanged) {
     XIHierarchyEvent* event = static_cast<XIHierarchyEvent*>(cookie->data);
     HandleHierarchyChangedEvent(event, &observer_list_);
     if (event->flags & XIDeviceEnabled || event->flags & XIDeviceDisabled)
       NotifyDeviceHierarchyChanged();
   }
 }
 
 void XInputHierarchyChangedEventListener::NotifyDeviceHierarchyChanged() {
   FOR_EACH_OBSERVER(DeviceHierarchyObserver,
                     observer_list_,
                     DeviceHierarchyChanged());
 }
 
 }  // namespace chromeos