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

ui/views/widget/native_widget_delegate.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 UI_VIEWS_WIDGET_NATIVE_WIDGET_DELEGATE_H_
 #define UI_VIEWS_WIDGET_NATIVE_WIDGET_DELEGATE_H_
 
 #include <vector>
 
 #include "ui/base/events/event_constants.h"
@@ skipping 89 matching lines @@
   // Paints the rootview in the canvas. This will also refresh the compositor
   // tree if necessary when accelerated painting is enabled.
   virtual void OnNativeWidgetPaint(gfx::Canvas* canvas) = 0;
 
   // Returns the non-client component (see ui/base/hit_test.h) containing
   // |point|, in client coordinates.
   virtual int GetNonClientComponent(const gfx::Point& point) = 0;
 
   // Mouse and key event handlers.
   virtual void OnKeyEvent(ui::KeyEvent* event) = 0;
-  virtual bool OnMouseEvent(const ui::MouseEvent& event) = 0;
+  virtual void OnMouseEvent(ui::MouseEvent* event) = 0;
   virtual void OnMouseCaptureLost() = 0;
 
   virtual void OnTouchEvent(ui::TouchEvent* event) = 0;
   virtual void OnScrollEvent(ui::ScrollEvent* event) = 0;
   virtual void OnGestureEvent(ui::GestureEvent* event) = 0;
 
   // Runs the specified native command. Returns true if the command is handled.
   virtual bool ExecuteCommand(int command_id) = 0;
 
   // Returns the input method of the widget this delegate is associated with.
@@ skipping 12 matching lines @@
 
   //
   virtual Widget* AsWidget() = 0;
   virtual const Widget* AsWidget() const = 0;
 };
 
 }  // namespace internal
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_NATIVE_WIDGET_DELEGATE_H_