Remove V8Binding::setDOMException.

We can easily replace the few callsites with ExceptionState methods, and
get better exception messages in the process.

BUG=270033

Review URL: https://codereview.chromium.org/171423014

git-svn-id: svn://svn.chromium.org/blink/trunk@167522 bbb929c8-8fbe-4397-9dbb-9b2b20218538