Mac: move content::RenderWidgetResizeHelper to ui::WindowResizeHelperMac (acelerated_widget_mac)

ui/accelerated_widget_mac/BUILD.gn

 # 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.
 
 # GYP version: ui/accelerated_widget_mac/accelerated_widget_mac.gyp:accelerated_widget_mac
 component("accelerated_widget_mac") {
   sources = [
     "accelerated_widget_mac.h",
     "accelerated_widget_mac.mm",
     "accelerated_widget_mac_export.h",
     "display_link_mac.cc",
     "display_link_mac.h",
     "io_surface_context.h",
     "io_surface_context.mm",
     "io_surface_layer.h",
     "io_surface_layer.mm",
     "io_surface_texture.h",
     "io_surface_texture.mm",
     "software_layer.h",
     "software_layer.mm",
     "surface_handle_types.cc",
     "surface_handle_types.h",
+    "window_resize_helper_mac.cc",
+    "window_resize_helper_mac.h",
   ]
 
   defines = [ "ACCELERATED_WIDGET_MAC_IMPLEMENTATION" ]
 
   deps = [
     "//base",
     "//skia",
     "//ui/base",
     "//ui/events",
     "//ui/events:events_base",
     "//ui/gfx/geometry",
     "//ui/gl",
   ]
 
   libs = [
     # Required by io_surface_texture.mm.
     "IOSurface.framework",
     "OpenGL.framework",
     "QuartzCore.framework",
   ]
 }