Move GuestView IPCs into their own messages file.

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 135 matching lines @@
         'common/features/simple_feature.cc',
         'common/features/simple_feature.h',
         'common/features/simple_feature_filter.cc',
         'common/features/simple_feature_filter.h',
         'common/features/behavior_feature.cc',
         'common/features/behavior_feature.h',
         'common/file_util.cc',
         'common/file_util.h',
         'common/guest_view/guest_view_constants.cc',
         'common/guest_view/guest_view_constants.h',
+        'common/guest_view_messages.h',
         'common/image_util.cc',
         'common/image_util.h',
         'common/install_warning.cc',
         'common/install_warning.h',
         'common/manifest.cc',
         'common/manifest.h',
         'common/manifest_constants.cc',
         'common/manifest_constants.h',
         'common/manifest_handler.cc',
         'common/manifest_handler.h',
@@ skipping 1069 matching lines @@
               '<(SHARED_INTERMEDIATE_DIR)/blink/devtools_resources.pak',
             ],
             'pak_output': '<(PRODUCT_DIR)/extensions_shell_and_test.pak',
           },
           'includes': [ '../build/repack_action.gypi' ],
         },
       ],
     },
   ]
 }