[Mac] Localize the cookie manager. Also rolls GTM r259:280.

DEPS

 vars = {
   "webkit_trunk":
     "http://svn.webkit.org/repository/webkit/trunk",
   "webkit_revision": "53511",
   "ffmpeg_revision": "34297",
   "skia_revision": "474",
   "chromium_git": "http://src.chromium.org/git",
 }
 
 deps = {
@@ skipping 115 matching lines @@
 
     # Parses Windows PE/COFF executable format.
     "src/third_party/pefile":
       "http://pefile.googlecode.com/svn/trunk@63",
   },
   "mac": {
     "src/chrome/tools/test/reference_build/chrome_mac":
       "/trunk/deps/reference_builds/chrome_mac@35421",
 
     "src/third_party/GTM":
-      "http://google-toolbox-for-mac.googlecode.com/svn/trunk@259",
+      "http://google-toolbox-for-mac.googlecode.com/svn/trunk@280",
     "src/third_party/pdfsqueeze":
       "http://pdfsqueeze.googlecode.com/svn/trunk@2",
     "src/third_party/lighttpd":
       "/trunk/deps/third_party/lighttpd@33737",
 
     "src/third_party/WebKit/WebKit/mac":
       Var("webkit_trunk") + "/WebKit/mac@" + Var("webkit_revision"),
     "src/third_party/WebKit/WebKitLibraries":
       Var("webkit_trunk") + "/WebKitLibraries@" + Var("webkit_revision"),
 
@@ skipping 88 matching lines @@
                "$matching_files"],
   },
   {
     # Workaround XCode dependecies problem.
     # TODO(bradnelson): remove this when fixed.
     "pattern": ".",
     "action": ["python",
                "src/build/mac/clobber_generated_headers.py"],
   },
 ]