ios: Switch from -std=gnu++0x to -std=c++11.

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 5117 matching lines @@
               }],  # mac_real_dsym
             ],  # target_conditions
           }],  # (_type=="executable" or _type=="shared_library" or
                #  _type=="loadable_module") and mac_strip!=0
         ],  # target_conditions
       },  # target_defaults
     }],  # OS=="mac"
     ['OS=="ios"', {
       'target_defaults': {
         'xcode_settings' : {
-          # TODO(stuartmorgan): switch to c++0x (see TODOs in the clang
-          # section above).
-          'CLANG_CXX_LANGUAGE_STANDARD': 'gnu++0x',
+          'CLANG_CXX_LANGUAGE_STANDARD': 'c++11',
 
           'conditions': [
             # Older Xcodes do not support -Wno-deprecated-register, so pass an
             # additional flag to suppress the "unknown compiler option" error.
             # Restrict this flag to builds that are either compiling with Xcode
             # or compiling with Xcode's Clang.  This will allow Ninja builds to
             # continue failing on unknown compiler options.
             # TODO(rohitrao): This flag is temporary and should be removed as
             # soon as the iOS bots are updated to use Xcode 5.1.
             ['clang_xcode==1', {
@@ skipping 722 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',
   },
 }