Remove MutableProfileOAuth2TokenService on iOS.

components/signin.gypi

 # Copyright 2014 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.
 
 {
   'targets': [
     {
       # GN version: //components/signin/core/common
       'target_name': 'signin_core_common',
       'type': 'static_library',
@@ skipping 59 matching lines @@
         'signin/core/browser/signin_oauth_helper.cc',
         'signin/core/browser/signin_oauth_helper.h',
         'signin/core/browser/signin_tracker.cc',
         'signin/core/browser/signin_tracker.h',
         'signin/core/browser/webdata/token_service_table.cc',
         'signin/core/browser/webdata/token_service_table.h',
         'signin/core/browser/webdata/token_web_data.cc',
         'signin/core/browser/webdata/token_web_data.h',
       ],
       'conditions': [
-        ['OS=="android"', {
+        ['OS=="android" or OS=="ios"', {
           'sources!': [
-            # Not used on Android.
+            # Not used on Android nor iOS.
             'signin/core/browser/mutable_profile_oauth2_token_service.cc',
             'signin/core/browser/mutable_profile_oauth2_token_service.h',
           ],
         }],
         ['chromeos==1', {
           'sources!': [
             'signin/core/browser/signin_manager.cc',
           ],
         }],
       ],
@@ skipping 37 matching lines @@
           'sources': [
             # Note: file list duplicated in GN build.
             'signin/ios/browser/profile_oauth2_token_service_ios.h',
             'signin/ios/browser/profile_oauth2_token_service_ios.mm',
           ],
         },
       ],
     }],
   ],
 }