diff --git a/content/xbl/src/nsBindingManager.cpp b/content/xbl/src/nsBindingManager.cpp
index 2b7dc949896..25de0d0d685 100644
--- a/content/xbl/src/nsBindingManager.cpp
+++ b/content/xbl/src/nsBindingManager.cpp
@@ -219,7 +219,7 @@ DocumentInfoHashtableTraverser(nsIURI* key,
   nsCycleCollectionTraversalCallback *cb = 
     static_cast<nsCycleCollectionTraversalCallback*>(userArg);
   NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(*cb, "mDocumentTable value");
-  cb->NoteXPCOMChild(static_cast<nsIScriptGlobalObjectOwner*>(di));
+  cb->NoteXPCOMChild(di);
   return PL_DHASH_NEXT;
 }
 
diff --git a/content/xbl/src/nsXBLBinding.cpp b/content/xbl/src/nsXBLBinding.cpp
index 1260cdfe124..9f0042a8e00 100644
--- a/content/xbl/src/nsXBLBinding.cpp
+++ b/content/xbl/src/nsXBLBinding.cpp
@@ -74,7 +74,7 @@ XBLFinalize(JSFreeOp *fop, JSObject *obj)
 {
   nsXBLDocumentInfo* docInfo =
     static_cast<nsXBLDocumentInfo*>(::JS_GetPrivate(obj));
-  nsContentUtils::DeferredFinalize(static_cast<nsIScriptGlobalObjectOwner*>(docInfo));
+  nsContentUtils::DeferredFinalize(docInfo);
   
   nsXBLJSClass* c = static_cast<nsXBLJSClass*>(::JS_GetClass(obj));
   c->Drop();
@@ -178,8 +178,7 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsXBLBinding)
   NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb,
                                      "mPrototypeBinding->XBLDocumentInfo()");
-  cb.NoteXPCOMChild(static_cast<nsIScriptGlobalObjectOwner*>(
-                      tmp->mPrototypeBinding->XBLDocumentInfo()));
+  cb.NoteXPCOMChild(tmp->mPrototypeBinding->XBLDocumentInfo());
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mContent)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mNextBinding)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDefaultInsertionPoint)
diff --git a/content/xbl/src/nsXBLDocumentInfo.cpp b/content/xbl/src/nsXBLDocumentInfo.cpp
index 2a6b481352c..af73a8dd2f8 100644
--- a/content/xbl/src/nsXBLDocumentInfo.cpp
+++ b/content/xbl/src/nsXBLDocumentInfo.cpp
@@ -458,9 +458,8 @@ nsXBLDocumentInfo::MarkInCCGeneration(uint32_t aGeneration)
 }
 
 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsXBLDocumentInfo)
-  NS_INTERFACE_MAP_ENTRY(nsIScriptGlobalObjectOwner)
   NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
-  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIScriptGlobalObjectOwner)
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
 NS_INTERFACE_MAP_END
 
 NS_IMPL_CYCLE_COLLECTING_ADDREF(nsXBLDocumentInfo)
@@ -711,18 +710,6 @@ nsXBLDocumentInfo::EnsureGlobalObject()
   }
 }
 
-//----------------------------------------------------------------------
-//
-// nsIScriptGlobalObjectOwner methods
-//
-
-nsIScriptGlobalObject*
-nsXBLDocumentInfo::GetScriptGlobalObject()
-{
-  EnsureGlobalObject();
-  return mGlobalObject;
-}
-
 #ifdef DEBUG
 void
 AssertInCompilationScope()
diff --git a/content/xbl/src/nsXBLDocumentInfo.h b/content/xbl/src/nsXBLDocumentInfo.h
index 143f8fab4ae..9c88d504e90 100644
--- a/content/xbl/src/nsXBLDocumentInfo.h
+++ b/content/xbl/src/nsXBLDocumentInfo.h
@@ -8,7 +8,6 @@
 #include "mozilla/Attributes.h"
 #include "nsCOMPtr.h"
 #include "nsAutoPtr.h"
-#include "nsIScriptGlobalObjectOwner.h"
 #include "nsWeakReference.h"
 #include "nsIDocument.h"
 #include "nsCycleCollectionParticipant.h"
@@ -17,8 +16,7 @@ class nsXBLPrototypeBinding;
 class nsObjectHashtable;
 class nsXBLDocGlobalObject;
 
-class nsXBLDocumentInfo : public nsIScriptGlobalObjectOwner,
-                          public nsSupportsWeakReference
+class nsXBLDocumentInfo : public nsSupportsWeakReference
 {
 public:
   NS_DECL_CYCLE_COLLECTING_ISUPPORTS
@@ -50,15 +48,11 @@ public:
 
   JSObject* GetCompilationGlobal();
 
-  // nsIScriptGlobalObjectOwner methods
-  virtual nsIScriptGlobalObject* GetScriptGlobalObject() MOZ_OVERRIDE;
-
   void MarkInCCGeneration(uint32_t aGeneration);
 
   static nsresult ReadPrototypeBindings(nsIURI* aURI, nsXBLDocumentInfo** aDocInfo);
 
-  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_AMBIGUOUS(nsXBLDocumentInfo,
-                                                         nsIScriptGlobalObjectOwner)
+  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(nsXBLDocumentInfo)
 
 private:
   void EnsureGlobalObject();