[iOS] Preserve global symbols when calling strip (-x) on today extensions.

test/ios/extension/extension.gyp

 # Copyright (c) 2014 Google Inc. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'make_global_settings': [
     ['CC', '/usr/bin/clang'],
     ['CXX', '/usr/bin/clang++'],
   ],
   'targets': [
@@ skipping 30 matching lines @@
       },
       'xcode_settings': {
         'OTHER_CFLAGS': [
           '-fobjc-abi-version=2',
         ],
         'INFOPLIST_FILE': 'ExtensionContainer/Info.plist',
         'GCC_VERSION': 'com.apple.compilers.llvm.clang.1_0',
         'ARCHS': [ 'armv7' ],
         'SDKROOT': 'iphoneos',
         'IPHONEOS_DEPLOYMENT_TARGET': '7.0',
-        'CODE_SIGN_IDENTITY[sdk=iphoneos*]': 'iPhone Developer',
+        'CODE_SIGNING_REQUIRED': 'NO',
+        'DEPLOYMENT_POSTPROCESSING': 'YES',
+        'STRIP_INSTALLED_PRODUCT': 'YES',
+        'CONFIGURATION_BUILD_DIR':'build/Default',
       },
     },
     {
       'target_name': 'ActionExtension',
       'product_name': 'ActionExtension',
       'type': 'executable',
       'mac_bundle': 1,
       'ios_app_extension': 1,
       'sources': [
         'ActionExtension/ActionViewController.h',
         'ActionExtension/ActionViewController.m',
       ],
       'link_settings': {
         'libraries': [
           '$(SDKROOT)/System/Library/Frameworks/Foundation.framework',
           '$(SDKROOT)/System/Library/Frameworks/UIKit.framework',
           '$(SDKROOT)/System/Library/Frameworks/MobileCoreServices.framework',
         ],
       },
       'xcode_settings': {
         'OTHER_CFLAGS': [
           '-fobjc-abi-version=2',
         ],
         'INFOPLIST_FILE': 'ActionExtension/Info.plist',
         'GCC_VERSION': 'com.apple.compilers.llvm.clang.1_0',
         'ARCHS': [ 'armv7' ],
         'SDKROOT': 'iphoneos',
         'IPHONEOS_DEPLOYMENT_TARGET': '7.0',
-        'CODE_SIGN_IDENTITY[sdk=iphoneos*]': 'iPhone Developer',
+        'CODE_SIGNING_REQUIRED': 'NO',
+        'DEPLOYMENT_POSTPROCESSING': 'YES',
+        'STRIP_INSTALLED_PRODUCT': 'YES',
+        'CONFIGURATION_BUILD_DIR':'build/Default',
       },
     },
   ],
 }