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

ash/wm/workspace/workspace_event_handler.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_WM_WORKSPACE_WORKSPACE_EVENT_HANDLER_H_
 #define ASH_WM_WORKSPACE_WORKSPACE_EVENT_HANDLER_H_
 
 #include "ash/wm/toplevel_window_event_handler.h"
 #include "ash/wm/workspace/multi_window_resize_controller.h"
 
 namespace aura {
 class Window;
 }
 
 namespace ash {
 namespace internal {
 
 class WorkspaceEventHandlerTestHelper;
 
 class WorkspaceEventHandler : public ToplevelWindowEventHandler {
  public:
   explicit WorkspaceEventHandler(aura::Window* owner);
   virtual ~WorkspaceEventHandler();
 
   // Overridden from ToplevelWindowEventHandler:
-  virtual ui::EventResult OnMouseEvent(ui::MouseEvent* event) OVERRIDE;
+  virtual void OnMouseEvent(ui::MouseEvent* event) OVERRIDE;
   virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
 
  private:
   friend class WorkspaceEventHandlerTestHelper;
 
   // Determines if |event| corresponds to a double click on either the top or
   // bottom vertical resize edge, and if so toggles the vertical height of the
   // window between its restored state and the full available height of the
   // workspace.
   void HandleVerticalResizeDoubleClick(aura::Window* target,
                                        ui::MouseEvent* event);
 
   MultiWindowResizeController multi_window_resize_controller_;
 
   // If non-NULL, set to true in the destructor.
   bool* destroyed_;
 
   DISALLOW_COPY_AND_ASSIGN(WorkspaceEventHandler);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_WM_WORKSPACE_WORKSPACE_EVENT_HANDLER_H_