GitLab

Custom JavaScript loader doesn't work on iOS because an origin check
fails outside v8 isolated world. Chrome should not overwrite these
callbacks on iOS.

BUG=none
TEST=none

Review URL: https://chromiumcodereview.appspot.com/23715006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@222254 0039d316-1c4b-4281-b951-d872f2087c98