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

ui/views/widget/native_widget_win.cc

 // 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.
 
 #include "ui/views/widget/native_widget_win.h"
 
 #include <dwmapi.h>
 #include <shellapi.h>
 
 #include <algorithm>
@@ skipping 742 matching lines @@
 }
 
 void NativeWidgetWin::HandleNativeBlur(HWND focused_window) {
   delegate_->OnNativeBlur(focused_window);
   InputMethod* input_method = GetInputMethod();
   if (input_method)
     input_method->OnBlur();
 }
 
 bool NativeWidgetWin::HandleMouseEvent(const ui::MouseEvent& event) {
-  return delegate_->OnMouseEvent(event);
+  delegate_->OnMouseEvent(const_cast<ui::MouseEvent*>(&event));
+  return event.handled();
 }
 
 bool NativeWidgetWin::HandleKeyEvent(const ui::KeyEvent& event) {
   delegate_->OnKeyEvent(const_cast<ui::KeyEvent*>(&event));
   return event.handled();
 }
 
 bool NativeWidgetWin::HandleUntranslatedKeyEvent(const ui::KeyEvent& event) {
   InputMethod* input_method = GetInputMethod();
   if (input_method)
@@ skipping 250 matching lines @@
 // static
 bool NativeWidgetPrivate::IsTouchDown() {
   // This currently isn't necessary because we're not generating touch events on
   // windows.  When we do, this will need to be updated.
   return false;
 }
 
 }  // namespace internal
 
 }  // namespace views