Build with configuration_policy enabled on iOS by default.

build/common.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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 640 matching lines @@
         }],
 
         # Disable WebRTC for building WebView as part of Android system.
         # TODO(boliu): Decide if we want WebRTC, and if so, also merge
         # the necessary third_party repositories.
         ['OS=="android" and android_webview_build==1', {
           'enable_webrtc%': 0,
         }],
 
         ['OS=="ios"', {
-          'configuration_policy%': 0,
           'disable_ftp_support%': 1,
           'enable_automation%': 0,
           'enable_extensions%': 0,
           'enable_google_now%': 0,
           'cld_version%': 1,
           'enable_printing%': 0,
           'enable_session_service%': 0,
           'enable_themes%': 0,
           'enable_webrtc%': 0,
           'notifications%': 0,
@@ skipping 4166 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }