base: Do not allow MessagePumpObservers to consume events.

chrome/browser/ui/views/tabs/tab_drag_controller.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_TABS_TAB_DRAG_CONTROLLER_H_
 #define CHROME_BROWSER_UI_VIEWS_TABS_TAB_DRAG_CONTROLLER_H_
 
 #include <vector>
 
 #include "base/memory/weak_ptr.h"
@@ skipping 221 matching lines @@
       content::WebContents* web_contents,
       const content::MediaStreamRequest& request,
       const content::MediaResponseCallback& callback) OVERRIDE;
 
   // Overridden from content::NotificationObserver:
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   // Overridden from MessageLoop::Observer:
-  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;
 
   // Overriden from views::WidgetObserver:
   virtual void OnWidgetBoundsChanged(views::Widget* widget,
                                      const gfx::Rect& new_bounds) OVERRIDE;
 
   // Overriden from TabStripModelObserver:
   virtual void TabStripEmpty() OVERRIDE;
 
   // Initialize the offset used to calculate the position to create windows
@@ skipping 383 matching lines @@
   // See comment around use for more details.
   int attach_x_;
   int attach_index_;
 
   base::WeakPtrFactory<TabDragController> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(TabDragController);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_TABS_TAB_DRAG_CONTROLLER_H_