Fix official build in GN

media/media_cdm_adapter.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.
 
 # This file defines a common base target for all CDM adapter implementations.
 # We use 'direct_dependent_settings' to override target type and settings so
 # that all CDM adapter implementations have the correct type and settings
 # automatically.
 #
 # WARNING: Keep 'cdmadapter' target out of media.gyp. /build/all.gyp:All depends
 # directly on media.gyp:*. If 'cdmadapter' is defined in media.gyp, then
 # 'direct_dependent_settings' will be applied to 'All' target and bad
 # things happen, e.g. the type of 'All' target becomes a plugin on Mac.
 {
   'conditions': [
     ['enable_pepper_cdms==1', {
       'targets': [
         {
-          # For GN, we may want a template that defines a target of the right
-          # type with the right dependencies.
+          # GN version: Use the template cdm_adapter in
+          # //media/cdm/ppapi/cdm_adapter.gni.
           'target_name': 'cdmadapter',
           'type': 'none',
           'direct_dependent_settings': {
             'sources': [
               'cdm/ppapi/api/content_decryption_module.h',
               'cdm/ppapi/cdm_adapter.cc',
               'cdm/ppapi/cdm_adapter.h',
               'cdm/ppapi/cdm_file_io_impl.cc',
               'cdm/ppapi/cdm_file_io_impl.h',
               'cdm/ppapi/cdm_helpers.cc',
@@ skipping 29 matching lines @@
                   'DYLIB_INSTALL_NAME_BASE': '@loader_path',
                 },
               }],
             ],
           },
         },
       ],
     }],
   ],
 }