base: Do not allow MessagePumpObservers to consume events.

chrome/browser/chromeos/device_uma.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_DEVICE_UMA_H_
 #define CHROME_BROWSER_CHROMEOS_DEVICE_UMA_H_
 
 #include "base/basictypes.h"
 #include "base/event_types.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 15 matching lines @@
   friend struct DefaultSingletonTraits<DeviceUMA>;
 
   DeviceUMA();
   virtual ~DeviceUMA();
 
   // Start and stop observing events.
   void AddMessageLoopObserver();
   void RemoveMessageLoopObserver();
 
   // MessageLoopForUI::Observer 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;
 
   // Check CrOS touchpad events to see if the metrics gesture is present
   void CheckTouchpadEvent(const base::NativeEvent& event);
 
   // Check the incoming events for interesting patterns that we care about.
   void CheckIncomingEvent(const base::NativeEvent& event);
 
   bool is_observing_;
 
   DISALLOW_COPY_AND_ASSIGN(DeviceUMA);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_DEVICE_UMA_H_