[ScreenOrientation] Merge mojo interface ScreenOrientationListener into ScreenOrientation

content/renderer/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/chromecast_build.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/split_static_library.gni")
 import("//media/media_options.gni")
 import("//ppapi/features/features.gni")
@@ skipping 317 matching lines @@
     "resizing_mode_selector.cc",
     "resizing_mode_selector.h",
     "sad_plugin.cc",
     "sad_plugin.h",
     "savable_resources.cc",
     "savable_resources.h",
     "scheduler/resource_dispatch_throttler.cc",
     "scheduler/resource_dispatch_throttler.h",
     "screen_orientation/screen_orientation_dispatcher.cc",
     "screen_orientation/screen_orientation_dispatcher.h",
-    "screen_orientation/screen_orientation_observer.cc",
-    "screen_orientation/screen_orientation_observer.h",
     "service_worker/embedded_worker_devtools_agent.cc",
     "service_worker/embedded_worker_devtools_agent.h",
     "service_worker/embedded_worker_dispatcher.cc",
     "service_worker/embedded_worker_dispatcher.h",
     "service_worker/embedded_worker_instance_client_impl.cc",
     "service_worker/embedded_worker_instance_client_impl.h",
     "service_worker/service_worker_context_client.cc",
     "service_worker/service_worker_context_client.h",
     "service_worker/service_worker_context_message_filter.cc",
     "service_worker/service_worker_context_message_filter.h",
@@ skipping 590 matching lines @@
     # For the defines in mojo_media_config.
     public_configs = [ "//media/mojo/services:mojo_media_config" ]
   }
 
   if (!is_component_build) {
     public_deps = [
       ":renderer",
     ]
   }
 }