Remove more ScriptState::current in core/

ScriptState::current should be called in the binding layer.

BUG=357144
NOTRY=true

Review URL: https://codereview.chromium.org/303103002

git-svn-id: svn://svn.chromium.org/blink/trunk@175146 bbb929c8-8fbe-4397-9dbb-9b2b20218538