MacViews: Remove const from NativeWidgetMac::OnRootViewLayout to match other NativeWidget*

ui/views/widget/native_widget_mac.mm

 // Copyright 2014 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_mac.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/mac/foundation_util.h"
 #include "base/mac/scoped_nsobject.h"
@@ skipping 479 matching lines @@
 }
 
 void NativeWidgetMac::SetVisibilityChangedAnimationsEnabled(bool value) {
   NOTIMPLEMENTED();
 }
 
 ui::NativeTheme* NativeWidgetMac::GetNativeTheme() const {
   return ui::NativeTheme::instance();
 }
 
-void NativeWidgetMac::OnRootViewLayout() const {
+void NativeWidgetMac::OnRootViewLayout() {
   NOTIMPLEMENTED();
 }
 
 bool NativeWidgetMac::IsTranslucentWindowOpacitySupported() const {
   return false;
 }
 
 void NativeWidgetMac::RepostNativeEvent(gfx::NativeEvent native_event) {
   NOTIMPLEMENTED();
 }
@@ skipping 86 matching lines @@
 }
 
 // static
 gfx::FontList NativeWidgetPrivate::GetWindowTitleFontList() {
   NOTIMPLEMENTED();
   return gfx::FontList();
 }
 
 }  // namespace internal
 }  // namespace views