diff --git a/embedding/browser/activex/src/control/guids.cpp b/embedding/browser/activex/src/control/guids.cpp
index b116209c25ad..6f9ae5bb38ca 100644
--- a/embedding/browser/activex/src/control/guids.cpp
+++ b/embedding/browser/activex/src/control/guids.cpp
@@ -34,7 +34,6 @@ NS_DEFINE_IID(kIDocumentViewerIID, NS_IDOCUMENT_VIEWER_IID);
 NS_DEFINE_IID(kIDOMDocumentIID, NS_IDOMDOCUMENT_IID);
 NS_DEFINE_IID(kIDOMNodeIID, NS_IDOMNODE_IID);
 NS_DEFINE_IID(kIDOMElementIID, NS_IDOMELEMENT_IID);
-NS_DEFINE_IID(kIWebShellContainerIID, NS_IWEB_SHELL_CONTAINER_IID);
 NS_DEFINE_IID(kIStreamObserverIID, NS_ISTREAMOBSERVER_IID);
 NS_DEFINE_IID(kIDocumentLoaderObserverIID, NS_IDOCUMENT_LOADER_OBSERVER_IID);
 NS_DEFINE_IID(kISupportsIID, NS_ISUPPORTS_IID);
diff --git a/embedding/browser/activex/src/control/guids.h b/embedding/browser/activex/src/control/guids.h
index 9b8e67a9ebc8..5eda064d9993 100644
--- a/embedding/browser/activex/src/control/guids.h
+++ b/embedding/browser/activex/src/control/guids.h
@@ -38,7 +38,6 @@ NS_EXTERN_IID(kIDocumentViewerIID);
 NS_EXTERN_IID(kIDOMDocumentIID);
 NS_EXTERN_IID(kIDOMNodeIID);
 NS_EXTERN_IID(kIDOMElementIID);
-NS_EXTERN_IID(kIWebShellContainerIID);
 NS_EXTERN_IID(kIStreamObserverIID);
 NS_EXTERN_IID(kIDocumentLoaderObserverIID);
 NS_EXTERN_IID(kISupportsIID);