Update Blink to use the tree scope info on WebFrame for scoping checks.

public/web/WebFrameClient.h

Index: public/web/WebFrameClient.h
diff --git a/public/web/WebFrameClient.h b/public/web/WebFrameClient.h
index 0fa1f0b522b883f6d39ae95ebf411abbdd5d20c3..1de7df29d595279f9b1c92d9de8619fe6e361a81 100644
--- a/public/web/WebFrameClient.h
+++ b/public/web/WebFrameClient.h
@@ -150,8 +150,6 @@ public:
     // Note: If you override this, you should almost certainly be overriding
     // frameDetached().
     virtual WebFrame* createChildFrame(WebLocalFrame* parent, WebTreeScopeType, const WebString& frameName, WebSandboxFlags sandboxFlags) { return nullptr; }
-    // TODO(dcheng): Remove this overload, since it's deprecated.
-    virtual WebFrame* createChildFrame(WebLocalFrame* parent, const WebString& frameName, WebSandboxFlags sandboxFlags) { return nullptr; }
 
     // This frame set its opener to null, disowning it.
     // See http://html.spec.whatwg.org/#dom-opener.