base: Do not allow MessagePumpObservers to consume events.

chrome/browser/chromeos/events/event_rewriter.h

 // Copyright 2014 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 CHROME_BROWSER_CHROMEOS_EVENTS_EVENT_REWRITER_H_
 #define CHROME_BROWSER_CHROMEOS_EVENTS_EVENT_REWRITER_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 48 matching lines @@
   // Gets DeviceType from the |device_name|.
   static DeviceType GetDeviceType(const std::string& device_name);
 
  private:
   friend class EventRewriterAshTest;
   friend class EventRewriterTest;
 
   void DeviceKeyPressedOrReleased(int device_id);
 
   // base::MessagePumpObserver overrides:
-  virtual base::EventStatus WillProcessEvent(
-      const base::NativeEvent& event) OVERRIDE;
+  virtual void WillProcessEvent(const base::NativeEvent& event) OVERRIDE;
   virtual void DidProcessEvent(const base::NativeEvent& event) OVERRIDE;
 
   // DeviceHierarchyObserver overrides:
   virtual void DeviceHierarchyChanged() OVERRIDE;
   virtual void DeviceAdded(int device_id) OVERRIDE;
   virtual void DeviceRemoved(int device_id) OVERRIDE;
 
   // We don't want to include Xlib.h here since it has polluting macros, so
   // define these locally.
   typedef unsigned long KeySym;
@@ skipping 116 matching lines @@
       keyboard_driven_event_rewriter_;
 
   const PrefService* pref_service_for_testing_;
 
   DISALLOW_COPY_AND_ASSIGN(EventRewriter);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_EVENTS_EVENT_REWRITER_H_