events: Update mouse-event handlers to not return EventResult.

ash/launcher/launcher_tooltip_manager.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 ASH_LAUNCHER_LAUNCHER_TOOLTIP_MANAGER_H_
 #define ASH_LAUNCHER_LAUNCHER_TOOLTIP_MANAGER_H_
 
 #include "ash/ash_export.h"
 #include "ash/shelf_types.h"
 #include "ash/wm/session_state_observer.h"
@@ skipping 58 matching lines @@
   void ResetTimer();
 
   // Stops the timer for the delayed showing |view_|.
   void StopTimer();
 
   // Returns true if the tooltip is currently visible.
   bool IsVisible();
 
 protected:
   // ui::EventHandler overrides:
-  virtual ui::EventResult OnMouseEvent(ui::MouseEvent* event) OVERRIDE;
+  virtual void OnMouseEvent(ui::MouseEvent* event) OVERRIDE;
   virtual void OnTouchEvent(ui::TouchEvent* event) OVERRIDE;
   virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
 
   // SessionStateObserver override:
   virtual void OnSessionStateEvent(SessionStateObserver::EventType event)
       OVERRIDE;
 
   // ShelfLayoutManager::Observer overrides:
   virtual void WillDeleteShelf() OVERRIDE;
   virtual void WillChangeVisibilityState(
@@ skipping 19 matching lines @@
   ShelfLayoutManager* shelf_layout_manager_;
   LauncherView* launcher_view_;
 
   DISALLOW_COPY_AND_ASSIGN(LauncherTooltipManager);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_LAUNCHER_LAUNCHER_TOOLTIP_MANAGER_H_