Fix reference builds on mac.

DEPS

 # This file is automatically processed to create .DEPS.git which is the file
 # that gclient uses under git.
 #
 # See http://code.google.com/p/chromium/wiki/UsingGit
 #
 # To test manually, run:
 #   python tools/deps2git/deps2git.py -o .DEPS.git
 #   gclient runhooks
 # DO NOT CHECK IN CHANGES TO .DEPS.git. It will be automatically updated by
 # a bot when you modify this one.
@@ skipping 400 matching lines @@
     "src/third_party/webdriver/pylib": None,
     "src/third_party/webgl": None,
     "src/third_party/webpagereplay": None,
     "src/third_party/webrtc": None,
     "src/third_party/yasm/source/patched-yasm": None,
     "src/tools/page_cycler/acid3": None,
     "src/v8": None,
   },
   "mac": {
     "src/chrome/tools/test/reference_build/chrome_mac":
-      "/trunk/deps/reference_builds/chrome_mac@254637",
+      "/trunk/deps/reference_builds/chrome_mac@255182",
 
     "src/third_party/google_toolbox_for_mac/src":
       (Var("googlecode_url") % "google-toolbox-for-mac") + "/trunk@" +
       Var("google_toolbox_for_mac_revision"),
 
     "src/third_party/pdfsqueeze":
       (Var("googlecode_url") % "pdfsqueeze") + "/trunk@5",
 
     "src/third_party/lighttpd":
       "/trunk/deps/third_party/lighttpd@" + Var("lighttpd_revision"),
@@ skipping 320 matching lines @@
                 "-s", "src/build/linux/bin/eu-strip.sha1",
     ],
   },
   {
     # A change to a .gyp, .gypi, or to GYP itself should run the generator.
     "name": "gyp",
     "pattern": ".",
     "action": ["python", "src/build/gyp_chromium"],
   },
 ]