Remove obsolete override "ios_extra_version_path".

components/version_info.gypi

 # Copyright 2015 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': {
-    # Some plaform want to override part of the version number generation
-    # (for example iOS uses a different value for PATCH level for canary).
-    # This can be done settings "extra_version_path" variable to the path
-    # of a file with the corresponding value overrides. If present it will
-    # be loaded after all other input files.
-    'extra_version_name': '',
     'conditions': [
       ['branding == "Chrome"', {
         'use_unofficial_version_number%': 0,
       }, {
         'use_unofficial_version_number%': 1,
       }],
     ],
   },
   'targets': [
     {
@@ skipping 63 matching lines @@
           'action': [
             'python',
             '<(version_py_path)',
             '-f', '<(version_path)',
             '-f', '<(branding_path)',
             '-f', '<(lastchange_path)',
             '<@(extra_version_flags)',
             '<(template_input_path)',
             '<@(_outputs)',
           ],
-          'conditions': [
-            ['extra_version_name!=""', {
-              'variables': {
-                'extra_version_flags': [
-                  '-f', '<(extra_version_name)',
-                ],
-              },
-              'inputs': [
-                '<(extra_version_name)'
-              ],
-            }],
-          ],
         },
       ],
     },
   ],
-  'conditions': [
-    ['OS=="ios"', {
-      'variables': {
-        # Use nested 'variables' to workaround how variables work with gyp (no
-        # determined ordering and thuse it is not possible to define a variable
-        # in function of another).
-        'variables': {
-          # Path to the file used to override the version PATH level on iOS.
-          # Default to ios/build/util/VERSION.
-          'ios_extra_version_path%': '../ios/build/util/VERSION',
-        },
-        'extra_version_name': '<(ios_extra_version_path)'
-      },
-    }],
-  ],
 }