Replace source pointer in cc::CopyOutputRequest with a base::UnguessableToken

content/browser/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.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//media/media_options.gni")
 import("//ppapi/features/features.gni")
 import("//printing/features/features.gni")
 import("//third_party/WebKit/public/public_features.gni")
@@ skipping 1170 matching lines @@
     "renderer_host/render_widget_host_impl.h",
     "renderer_host/render_widget_host_input_event_router.cc",
     "renderer_host/render_widget_host_input_event_router.h",
     "renderer_host/render_widget_host_owner_delegate.h",
     "renderer_host/render_widget_host_view_aura.cc",
     "renderer_host/render_widget_host_view_aura.h",
     "renderer_host/render_widget_host_view_base.cc",
     "renderer_host/render_widget_host_view_base.h",
     "renderer_host/render_widget_host_view_base_observer.cc",
     "renderer_host/render_widget_host_view_base_observer.h",
+    "renderer_host/render_widget_host_view_frame_subscriber.h",
     "renderer_host/render_widget_host_view_mac.h",
     "renderer_host/render_widget_host_view_mac.mm",
     "renderer_host/render_widget_host_view_mac_dictionary_helper.h",
     "renderer_host/render_widget_host_view_mac_dictionary_helper.mm",
     "renderer_host/render_widget_host_view_mac_editcommand_helper.h",
     "renderer_host/render_widget_host_view_mac_editcommand_helper.mm",
     "renderer_host/renderer_frame_manager.cc",
     "renderer_host/renderer_frame_manager.h",
     "renderer_host/sandbox_ipc_linux.cc",
     "renderer_host/sandbox_ipc_linux.h",
@@ skipping 817 matching lines @@
   if (!is_component_build) {
     public_deps = [
       ":browser",
     ]
   } else {
     public_deps = [
       "//third_party/leveldatabase",
     ]
   }
 }