Convert to new enter method

ppapi/ppapi_shared.gypi

 # Copyright (c) 2012 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': {
      'conditions': [
         ['inside_chromium_build==0', {
             'webkit_src_dir': '../../../..',
         },{
@@ skipping 118 matching lines @@
         'shared_impl/private/net_address_private_impl.h',
 
         'shared_impl/private/ppb_font_shared.cc',
         'shared_impl/private/ppb_font_shared.h',
 
         'shared_impl/private/tcp_socket_private_impl.cc',
         'shared_impl/private/tcp_socket_private_impl.h',
         'shared_impl/private/udp_socket_private_impl.cc',
         'shared_impl/private/udp_socket_private_impl.h',
 
-        'thunk/common.h',
-        'thunk/common.cc',
         'thunk/enter.cc',
         'thunk/enter.h',
         'thunk/ppb_audio_api.h',
         'thunk/ppb_audio_config_api.h',
         'thunk/ppb_audio_config_thunk.cc',
         'thunk/ppb_audio_input_api.h',
         'thunk/ppb_audio_input_thunk.cc',
         'thunk/ppb_audio_input_trusted_thunk.cc',
         'thunk/ppb_audio_thunk.cc',
         'thunk/ppb_audio_trusted_thunk.cc',
@@ skipping 83 matching lines @@
         'thunk/ppb_websocket_api.h',
         'thunk/ppb_websocket_thunk.cc',
         'thunk/ppb_widget_api.h',
         'thunk/ppb_widget_thunk.cc',
         'thunk/ppb_zoom_thunk.cc',
         'thunk/thunk.h',
       ],
     },
   ],
 }