Removed GetDocument from the docshell interface. r=hyatt

docshell/base/nsIDocShell.idl

@@ -82,11 +82,6 @@ interface nsIDocShell : nsISupports
 	*/
 	[noscript]void setDocument(in nsIDOMDocument document, in nsIDOMElement rootNode);
 
-	/*
-	The current document that is loaded in the DocShell.
-	*/
-	readonly attribute nsIDOMDocument document;
-
 	/*
 	The current URI that is loaded.
 	*/