GitLab

Changes required to hide addEventListener,
moving it from webRequest to webRequestInternal.

BUG=115467
TEST=loading extensions from the ticket 115467 and observing the behaviour

Review URL: https://chromiumcodereview.appspot.com/10310028

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@138481 0039d316-1c4b-4281-b951-d872f2087c98