Fix NOTIMPLEMENTEDs in RenderMessageFilterAura... use the same codepath POSIX does.

content/content_browser.gypi

 # Copyright (c) 2011 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.
 
 {
   'dependencies': [
     '../crypto/crypto.gyp:crypto',
     '../net/net.gyp:net',
     '../net/net.gyp:http_server',
     '../ppapi/ppapi_internal.gyp:ppapi_proxy',
@@ skipping 382 matching lines @@
     'browser/renderer_host/quota_dispatcher_host.cc',
     'browser/renderer_host/quota_dispatcher_host.h',
     'browser/renderer_host/native_web_keyboard_event_aura.cc',
     'browser/renderer_host/native_web_keyboard_event_gtk.cc',
     'browser/renderer_host/native_web_keyboard_event_mac.mm',
     'browser/renderer_host/native_web_keyboard_event_win.cc',
     'browser/renderer_host/redirect_to_file_resource_handler.cc',
     'browser/renderer_host/redirect_to_file_resource_handler.h',
     'browser/renderer_host/render_message_filter.cc',
     'browser/renderer_host/render_message_filter.h',
-    'browser/renderer_host/render_message_filter_aura.cc',
     'browser/renderer_host/render_message_filter_win.cc',
     'browser/renderer_host/render_process_host.cc',
     'browser/renderer_host/render_process_host.h',
     'browser/renderer_host/render_sandbox_host_linux.cc',
     'browser/renderer_host/render_sandbox_host_linux.h',
     'browser/renderer_host/render_view_host.cc',
     'browser/renderer_host/render_view_host.h',
     'browser/renderer_host/render_view_host_delegate.cc',
     'browser/renderer_host/render_view_host_delegate.h',
     'browser/renderer_host/render_view_host_factory.cc',
@@ skipping 366 matching lines @@
         'browser/renderer_host/java/java_bridge_dispatcher_host_manager.h',
         'browser/renderer_host/java/java_bridge_dispatcher_host.cc',
         'browser/renderer_host/java/java_bridge_dispatcher_host.h',
         'browser/renderer_host/java/java_method.cc',
         'browser/renderer_host/java/java_method.h',
       ],
     }],
   ],
 }