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

content/public/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/ui.gni")
 
 # See //content/BUILD.gn for how this works.
 group("browser") {
   if (is_component_build) {
     public_deps = [
@@ skipping 182 matching lines @@
     "push_messaging_service.h",
     "quota_permission_context.h",
     "readback_types.h",
     "render_frame_host.h",
     "render_process_host.h",
     "render_process_host_factory.h",
     "render_process_host_observer.h",
     "render_view_host.h",
     "render_widget_host.h",
     "render_widget_host_view.h",
-    "render_widget_host_view_frame_subscriber.h",
     "render_widget_host_view_mac_delegate.h",
     "renderer_unresponsive_type.h",
     "resource_context.h",
     "resource_dispatcher_host.cc",
     "resource_dispatcher_host.h",
     "resource_dispatcher_host_delegate.cc",
     "resource_dispatcher_host_delegate.h",
     "resource_dispatcher_host_login_delegate.h",
     "resource_hints.h",
     "resource_request_details.cc",
@@ skipping 111 matching lines @@
 
   if (is_android) {
     deps += [ "//ui/android" ]
   }
 
   if (use_aura) {
     sources -= [ "context_factory.h" ]
     deps += [ "//ui/aura" ]
   }
 }