Do not pass -dead_strip to ld for the Mac helper and main apps.

chrome/chrome.gyp

 # 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.
 {
   'variables': {
     'chromium_code': 1,
 
     'variables': {
       'version_py_path': 'tools/build/version.py',
       'version_path': 'VERSION',
@@ skipping 402 matching lines @@
           # resources directory.
           'mac_bundle_resources/': [
             ['exclude', '.*'],
           ],
           'xcode_settings': {
             'CHROMIUM_BUNDLE_ID': '<(mac_bundle_id)',
             'CHROMIUM_SHORT_NAME': '<(branding)',
             'CHROMIUM_STRIP_SAVE_FILE': 'app/app.saves',
             'INFOPLIST_FILE': 'app/helper-Info.plist',
           },
+          # Turn off -dead_strip in Release mode for the main app. There's
+          # little here to strip, and doing so preserves symbols from
+          # crt1.10.6.o, which get removed incorrectly. http://crbug.com/139902
+          'configurations': {
+            'Release': {
+              'xcode_settings': {
+                'DEAD_CODE_STRIPPING': 'NO',
+              },
+            },
+          },
           'postbuilds': [
             {
               # The helper doesn't have real localizations, it just has
               # empty .lproj directories, which is enough to convince Cocoa
               # that anything running out of the helper .app supports those
               # languages.
               'postbuild_name': 'Make Empty Localizations',
               'variables': {
                 'locale_dirs': [
                   '>!@(<(apply_locales_cmd) -d ZZLOCALE.lproj <(locales))',
@@ skipping 625 matching lines @@
           'sources': [
             'browser/safe_browsing/signature_util.h',
             'browser/safe_browsing/signature_util_win.cc',
             'tools/safe_browsing/sb_sigutil.cc',
           ],
         },
       ]},  # 'targets'
     ],  # OS=="win"
   ],  # 'conditions'
 }