Add delegate to install web_contents helpers for MimeHandlerView.

extensions/extensions.gyp

 # Copyright 2013 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 548 matching lines @@
         'browser/guest_view/guest_view_base.cc',
         'browser/guest_view/guest_view_base.h',
         'browser/guest_view/guest_view_constants.cc',
         'browser/guest_view/guest_view_constants.h',
         'browser/guest_view/guest_view_manager_factory.h',
         'browser/guest_view/guest_view_manager.cc',
         'browser/guest_view/guest_view_manager.h',
         'browser/guest_view/guest_view.h',
         'browser/guest_view/mime_handler_view/mime_handler_view_constants.cc',
         'browser/guest_view/mime_handler_view/mime_handler_view_constants.h',
+        'browser/guest_view/mime_handler_view/mime_handler_view_guest_delegate.h',
         'browser/guest_view/mime_handler_view/mime_handler_view_guest.cc',
         'browser/guest_view/mime_handler_view/mime_handler_view_guest.h',
         'browser/guest_view/web_view/javascript_dialog_helper.cc',
         'browser/guest_view/web_view/javascript_dialog_helper.h',
         'browser/guest_view/web_view/web_view_constants.cc',
         'browser/guest_view/web_view/web_view_constants.h',
         'browser/guest_view/web_view/web_view_guest.cc',
         'browser/guest_view/web_view/web_view_guest.h',
         'browser/guest_view/web_view/web_view_guest_delegate.cc',
         'browser/guest_view/web_view/web_view_guest_delegate.h',
@@ skipping 521 matching lines @@
           'browser/api/cast_channel/logging.proto'
       ],
       'variables': {
           'proto_in_dir': 'browser/api/cast_channel',
           'proto_out_dir': 'extensions/browser/api/cast_channel',
       },
       'includes': [ '../build/protoc.gypi' ]
     },
   ]
 }