Add one more file to the OOPI watchlist.

Just a watchlist for catching methods being added to WebFrame that
really belong on WebLocalFrame.

Review URL: https://codereview.chromium.org/593783003

git-svn-id: svn://svn.chromium.org/blink/trunk@182454 bbb929c8-8fbe-4397-9dbb-9b2b20218538