Doh. There's more bustage in this file.

xpcom/build/nsXPComInit.cpp

@@ -262,7 +262,7 @@ static const nsModuleComponentInfo components[] = {
 
     COMPONENT_SUPPORTS(ID, ID),
     COMPONENT_SUPPORTS(STRING, String),
-    COMPONENT_SUPPORTS(WSTRING, WString),
+    COMPONENT_SUPPORTS(CSTRING, CString),
     COMPONENT_SUPPORTS(PRBOOL, PRBool),
     COMPONENT_SUPPORTS(PRUINT8, PRUint8),
     COMPONENT_SUPPORTS(PRUINT16, PRUint16),