base: Do not allow MessagePumpObservers to consume events.

chrome/browser/chromeos/events/system_key_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/system_key_event_listener.h"
 
 #define XK_MISCELLANY 1
 #include <X11/keysymdef.h>
 #include <X11/XF86keysym.h>
 #include <X11/XKBlib.h>
@@ skipping 58 matching lines @@
   Stop();
 }
 
 void SystemKeyEventListener::Stop() {
   if (stopped_)
     return;
   base::MessageLoopForUI::current()->RemoveObserver(this);
   stopped_ = true;
 }
 
-base::EventStatus SystemKeyEventListener::WillProcessEvent(
-    const base::NativeEvent& event) {
-  return ProcessedXEvent(event) ? base::EVENT_HANDLED : base::EVENT_CONTINUE;
+void SystemKeyEventListener::WillProcessEvent(const base::NativeEvent& event) {
+  ProcessedXEvent(event);
 }
 
 void SystemKeyEventListener::DidProcessEvent(const base::NativeEvent& event) {
 }
 
-bool SystemKeyEventListener::ProcessedXEvent(XEvent* xevent) {
+void SystemKeyEventListener::ProcessedXEvent(XEvent* xevent) {
   input_method::InputMethodManager* input_method_manager =
       input_method::InputMethodManager::Get();
 
   if (xevent->type == xkb_event_base_) {
     // TODO(yusukes): Move this part to aura::WindowTreeHost.
     XkbEvent* xkey_event = reinterpret_cast<XkbEvent*>(xevent);
     if (xkey_event->any.xkb_type == XkbStateNotify) {
       if (xkey_event->state.mods) {
         // TODO(yusukes,adlr): Let the user know that num lock is unsupported.
         // Force turning off Num Lock (crosbug.com/29169)
         input_method_manager->GetXKeyboard()->DisableNumLock();
       }
-      return true;
     }
   }
-  return false;
 }
 
 }  // namespace chromeos