views: Make view::Views::GetPreferredSize() const.

ui/views/controls/native/native_view_host.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/controls/native/native_view_host.h"
 
 #include "base/logging.h"
 #include "ui/base/cursor/cursor.h"
 #include "ui/gfx/canvas.h"
 #include "ui/views/accessibility/native_view_accessibility.h"
@@ skipping 47 matching lines @@
 
 void NativeViewHost::NativeViewDestroyed() {
   // Detach so we can clear our state and notify the native_wrapper_ to release
   // ref on the native view.
   Detach(true);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // NativeViewHost, View overrides:
 
-gfx::Size NativeViewHost::GetPreferredSize() {
+gfx::Size NativeViewHost::GetPreferredSize() const {
   return preferred_size_;
 }
 
 void NativeViewHost::Layout() {
   if (!native_view_ || !native_wrapper_.get())
     return;
 
   gfx::Rect vis_bounds = GetVisibleBounds();
   bool visible = !vis_bounds.IsEmpty();
 
@@ skipping 136 matching lines @@
   Widget::Widgets widgets;
   Widget::GetAllChildWidgets(native_view(), &widgets);
   for (Widget::Widgets::iterator i = widgets.begin(); i != widgets.end(); ++i) {
     focus_manager->ViewRemoved((*i)->GetRootView());
     if (!focus_manager->GetFocusedView())
       return;
   }
 }
 
 }  // namespace views