[V8] ScriptState::isolate() should use Context::GetIsolate()
https://bugs.webkit.org/show_bug.cgi?id=107490

Reviewed by Adam Barth.

Now V8 provides Context::GetIsolate(). We should use it
in ScriptState::isolate().

* bindings/v8/ScriptState.h:
(WebCore::ScriptState::isolate):
(ScriptState):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@140387 268f45cc-cd09-0410-ab3c-d52691b4dbfc