Remove a PassRefPtr<DOMWrapperWorld> parameter from V8PerContextData

Now that things are well designed, and the parameter is unused.

BUG=357144

Review URL: https://codereview.chromium.org/262803002

git-svn-id: svn://svn.chromium.org/blink/trunk@173075 bbb929c8-8fbe-4397-9dbb-9b2b20218538