Bring back -fstack-protector-all on iOS.

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 2803 matching lines @@
                 ],
               }],
             ],
           }],
           ['OS=="linux" and target_arch!="ia32" and disable_glibcxx_debug==0', {
             # Enable libstdc++ debugging facilities to help catch problems
             # early, see http://crbug.com/65151 .
             # TODO(phajdan.jr): Should we enable this for all of POSIX?
             'defines': ['_GLIBCXX_DEBUG=1',],
           }],
-          # Disabled on iOS because it was causing a crash on startup.
-          # TODO(michelea): investigate, create a reduced test and possibly
-          # submit a radar.
-          ['release_valgrind_build==0 and OS!="ios"', {
+          ['release_valgrind_build==0', {
             'xcode_settings': {
               'OTHER_CFLAGS': [
                 '-fstack-protector-all',  # Implies -fstack-protector
               ],
             },
           }],
         ],
       },
       'Release_Base': {
         'abstract': 1,
@@ skipping 2215 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',
   },
 }