https://bugs.webkit.org/show_bug.cgi?id=71969

Reviewed by Darin Adler.

Source/JavaScriptCore: 

* runtime/JSGlobalObject.h: Removed allowsAccessFrom from JSGlobalObject since it is exclusive to 
JSDOMWindowBase and WebScriptObject.

Source/WebCore: 

No new tests.

Since allowsAccessFrom is only used by WebScriptObject, we know that we'll always have a 
JSDOMWindowBase, so we can simply have allowsAccessFrom to live in JSDOMWindowBase rather 
than JSGlobalObject.

* bindings/js/JSDOMWindowBase.h: De-virtualized allowsAccessFrom.
* bindings/objc/WebScriptObject.mm:
(-[WebScriptObject _isSafeScript]): Added a cast from a JSGlobalObject to a JSDOMWindowBase in 
order to call the allowsAccessFrom method.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@99993 268f45cc-cd09-0410-ab3c-d52691b4dbfc