Bug 1220596 - Remove interface declarations that are no longer needed in nsIDocShell. r=smaug IGNORE IDL

docshell/base/nsIDocShell.idl

@@ -23,11 +23,9 @@ class nsIPresShell;
 interface nsIURI;
 interface nsIChannel;
 interface nsIContentViewer;
-interface nsIURIContentListener;
 interface nsIDOMEventTarget;
 interface nsIDocShellLoadInfo;
 interface nsIEditor;
-interface nsIWebNavigation;
 interface nsISimpleEnumerator;
 interface nsIInputStream;
 interface nsIRequest;
@@ -38,7 +36,6 @@ interface nsIScriptGlobalObject;
 interface nsIDOMStorage;
 interface nsIPrincipal;
 interface nsIWebBrowserPrint;
-interface nsIVariant;
 interface nsIPrivacyTransitionObserver;
 interface nsIReflowObserver;
 interface nsIScrollObserver;