Update window region after widget resizes not changing HWND size

ui/views/widget/desktop_aura/desktop_window_tree_host_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/desktop_aura/desktop_window_tree_host_win.h"
 
 #include "base/win/metro.h"
 #include "third_party/skia/include/core/SkPath.h"
 #include "third_party/skia/include/core/SkRegion.h"
 #include "ui/aura/client/aura_constants.h"
@@ skipping 468 matching lines @@
       bounds.width() + window_expansion_bottom_right_delta_.x(),
       bounds.height() + window_expansion_bottom_right_delta_.y());
 
   gfx::Rect new_expanded(
       expanded.origin(),
       GetExpandedWindowSize(message_handler_->window_ex_style(),
                             expanded.size()));
   window_enlargement_ =
       gfx::Vector2d(new_expanded.width() - expanded.width(),
                     new_expanded.height() - expanded.height());
-  message_handler_->SetBounds(new_expanded);
-
-  // The client area size may have changed even though the window bounds have
-  // not, if the window bounds were expanded to 64 pixels both times.
-  if (old_hwnd_size == new_expanded.size() && old_content_size != bounds.size())
-    HandleClientSizeChanged(new_expanded.size());
+  message_handler_->SetBounds(new_expanded, old_content_size != bounds.size());
 }
 
 gfx::Point DesktopWindowTreeHostWin::GetLocationOnNativeScreen() const {
   return GetBounds().origin();
 }
 
 void DesktopWindowTreeHostWin::SetCapture() {
   message_handler_->SetCapture();
 }
 
@@ skipping 447 matching lines @@
 
 // static
 DesktopWindowTreeHost* DesktopWindowTreeHost::Create(
     internal::NativeWidgetDelegate* native_widget_delegate,
     DesktopNativeWidgetAura* desktop_native_widget_aura) {
   return new DesktopWindowTreeHostWin(native_widget_delegate,
                                       desktop_native_widget_aura);
 }
 
 }  // namespace views