Always use opaque frame for extension app windows

chrome/browser/views/frame/opaque_browser_frame_view.cc

 // Copyright (c) 2010 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 "chrome/browser/views/frame/opaque_browser_frame_view.h"
 
 #include "app/l10n_util.h"
 #include "app/resource_bundle.h"
 #include "app/theme_provider.h"
 #include "base/compiler_specific.h"
@@ skipping 243 matching lines @@
 // OpaqueBrowserFrameView, views::NonClientFrameView implementation:
 
 gfx::Rect OpaqueBrowserFrameView::GetBoundsForClientView() const {
   return client_view_bounds_;
 }
 
 bool OpaqueBrowserFrameView::AlwaysUseNativeFrame() const {
   return frame_->AlwaysUseNativeFrame();
 }
 
+bool OpaqueBrowserFrameView::AlwaysUseCustomFrame() const {
+  return true;
+}
+
 gfx::Rect OpaqueBrowserFrameView::GetWindowBoundsForClientBounds(
     const gfx::Rect& client_bounds) const {
   int top_height = NonClientTopBorderHeight();
   int border_thickness = NonClientBorderThickness();
   return gfx::Rect(std::max(0, client_bounds.x() - border_thickness),
                    std::max(0, client_bounds.y() - top_height),
                    client_bounds.width() + (2 * border_thickness),
                    client_bounds.height() + top_height + border_thickness);
 }
 
@@ skipping 735 matching lines @@
 }
 
 gfx::Rect OpaqueBrowserFrameView::CalculateClientAreaBounds(int width,
                                                             int height) const {
   int top_height = NonClientTopBorderHeight();
   int border_thickness = NonClientBorderThickness();
   return gfx::Rect(border_thickness, top_height,
                    std::max(0, width - (2 * border_thickness)),
                    std::max(0, height - top_height - border_thickness));
 }