Remove the deprecated 'HandleScope::Close' from generated bindings.

BUG=324225
R=dcarney@chromium.org

Review URL: https://codereview.chromium.org/96173005

git-svn-id: svn://svn.chromium.org/blink/trunk@162895 bbb929c8-8fbe-4397-9dbb-9b2b20218538