MacViews: Don't draw custom frame on Mac

chrome/browser/ui/views/frame/opaque_browser_frame_view.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 "chrome/browser/ui/views/frame/opaque_browser_frame_view.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 570 matching lines @@
 
 int OpaqueBrowserFrameView::NonClientBorderThickness() const {
   return layout_->NonClientBorderThickness();
 }
 
 gfx::Rect OpaqueBrowserFrameView::IconBounds() const {
   return layout_->IconBounds();
 }
 
 bool OpaqueBrowserFrameView::ShouldShowWindowTitleBar() const {
-#if defined(OS_LINUX) && !defined(OS_CHROMEOS)
   // Do not show the custom title bar if the system title bar option is enabled.
   if (!frame()->UseCustomFrame())
     return false;
-#endif
 
   // Do not show caption buttons if the window manager is forcefully providing a
   // title bar (e.g., in Ubuntu Unity, if the window is maximized).
   if (!views::ViewsDelegate::views_delegate)
     return true;
   return !views::ViewsDelegate::views_delegate->WindowManagerProvidesTitleBar(
               IsMaximized());
 }
 
 void OpaqueBrowserFrameView::PaintRestoredFrameBorder(gfx::Canvas* canvas) {
@@ skipping 318 matching lines @@
 
 int OpaqueBrowserFrameView::GetTopAreaHeight() const {
   gfx::ImageSkia* frame_image = GetFrameImage();
   int top_area_height = frame_image->height();
   if (browser_view()->IsTabStripVisible()) {
     top_area_height = std::max(top_area_height,
       GetBoundsForTabStrip(browser_view()->tabstrip()).bottom());
   }
   return top_area_height;
 }