Make chrome/common compile in GN

third_party/adobe/flash/flash_player.gyp

 # 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': {
     'flapper_version_h_file%': 'flapper_version.h',
     'flapper_binary_files%': [],
     'conditions': [
       [ 'branding == "Chrome"', {
@@ skipping 41 matching lines @@
             ],
           }],
         ],
       }],
     ],
   },
   # Always provide a target, so we can put the logic about whether there's
   # anything to be done in this file (instead of a higher-level .gyp file).
   'targets': [
     {
+      # GN version: //third_party/adobe/flash:flapper_version_h
       'target_name': 'flapper_version_h',
       'type': 'none',
       'copies': [{
         'destination': '<(SHARED_INTERMEDIATE_DIR)',
         'files': [ '<(flapper_version_h_file)' ],
       }],
     },
     {
+      # GN version: //third_party/adobe/flash:flapper_binaries
       'target_name': 'flapper_binaries',
       'type': 'none',
       'copies': [{
         'destination': '<(PRODUCT_DIR)/PepperFlash',
         'files': [ '<@(flapper_binary_files)' ],
       }],
     },
   ],
 }