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

chrome/chrome.gyp

Index: chrome/chrome.gyp
diff --git a/chrome/chrome.gyp b/chrome/chrome.gyp
index 860a1ddcfa06b9edd1fab0b1c4d2c8e7902d486b..73a630d50b22d42085effc35732680b0666364af 100644
--- a/chrome/chrome.gyp
+++ b/chrome/chrome.gyp
@@ -420,6 +420,16 @@
             '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