base: Do not allow MessagePumpObservers to consume events.

ui/aura/test/ui_controls_factory_aurax11.cc

 // Copyright 2013 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 <X11/keysym.h>
 #include <X11/Xlib.h>
 
 #include "base/logging.h"
 #include "ui/aura/client/screen_position_client.h"
 #include "ui/aura/env.h"
@@ skipping 31 matching lines @@
       : closure_(closure),
         matcher_(matcher) {
     base::MessageLoopForUI::current()->AddObserver(this);
   }
 
   virtual ~EventWaiter() {
     base::MessageLoopForUI::current()->RemoveObserver(this);
   }
 
   // MessageLoop::Observer implementation:
-  virtual base::EventStatus WillProcessEvent(
-      const base::NativeEvent& event) OVERRIDE {
+  virtual void WillProcessEvent(const base::NativeEvent& event) OVERRIDE {
     if ((*matcher_)(event)) {
       base::MessageLoop::current()->PostTask(FROM_HERE, closure_);
       delete this;
     }
-    return base::EVENT_CONTINUE;
   }
 
   virtual void DidProcessEvent(const base::NativeEvent& event) OVERRIDE {
   }
 
  private:
   base::Closure closure_;
   EventWaiterMatcher matcher_;
   DISALLOW_COPY_AND_ASSIGN(EventWaiter);
 };
@@ skipping 187 matching lines @@
 };
 
 }  // namespace
 
 UIControlsAura* CreateUIControlsAura(WindowTreeHost* host) {
   return new UIControlsX11(host);
 }
 
 }  // namespace test
 }  // namespace aura