Get rid of the EnableClose() infrastructure in Widget.

ui/views/widget/widget.cc

 // Copyright (c) 2011 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/widget.h"
 
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/utf_string_conversions.h"
 #include "ui/base/hit_test.h"
@@ skipping 471 matching lines @@
 
     native_widget_->Close();
     widget_closed_ = true;
   }
 }
 
 void Widget::CloseNow() {
   native_widget_->CloseNow();
 }
 
-void Widget::EnableClose(bool enable) {
-  if (non_client_view_)
-    non_client_view_->EnableClose(enable);
-  native_widget_->EnableClose(enable);
-}
-
 void Widget::Show() {
   if (non_client_view_) {
     if (saved_show_state_ == ui::SHOW_STATE_MAXIMIZED &&
         !initial_restored_bounds_.IsEmpty()) {
       native_widget_->ShowMaximizedWithBounds(initial_restored_bounds_);
     } else {
       native_widget_->ShowWithWindowState(saved_show_state_);
     }
     // |saved_show_state_| only applies the first time the window is shown.
     // If we don't reset the value the window may be shown maximized every time
@@ skipping 701 matching lines @@
 
 ////////////////////////////////////////////////////////////////////////////////
 // internal::NativeWidgetPrivate, NativeWidget implementation:
 
 internal::NativeWidgetPrivate* NativeWidgetPrivate::AsNativeWidgetPrivate() {
   return this;
 }
 
 }  // namespace internal
 }  // namespace views