GitLab

Switch to NSStrings; NSNumbers may be tagged pointers.

BUG=244703
TEST=Mac 64 tester goes green

Review URL: https://chromiumcodereview.appspot.com/15690016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@202944 0039d316-1c4b-4281-b951-d872f2087c98