Add MutationObserverInit

Source/core/dom/MutationObserver.h

Index: Source/core/dom/MutationObserver.h
diff --git a/Source/core/dom/MutationObserver.h b/Source/core/dom/MutationObserver.h
index 910796463d4296d3411e37b4158c6902b9a65e9d..d372b359ed35da252945d97427b9a71e421df707 100644
--- a/Source/core/dom/MutationObserver.h
+++ b/Source/core/dom/MutationObserver.h
@@ -46,6 +46,7 @@ class Dictionary;
 class ExceptionState;
 class MutationCallback;
 class MutationObserver;
+class MutationObserverInit;
 class MutationObserverRegistration;
 class MutationRecord;
 class Node;
@@ -85,7 +86,7 @@ public:
 
     ~MutationObserver();
 
-    void observe(Node*, const Dictionary&, ExceptionState&);
+    void observe(Node*, const MutationObserverInit&, ExceptionState&);
     WillBeHeapVector<RefPtrWillBeMember<MutationRecord> > takeRecords();
     void disconnect();
     void observationStarted(MutationObserverRegistration*);