Bug 1480222 part 4: Give css ErrorReporter.h an actual nsString.h include (not nsStringFwd), since it has actual nsString member-vars which need full definition. r=TYLin

Differential Revision: https://phabricator.services.mozilla.com/D2632

layout/style/ErrorReporter.h

@@ -9,7 +9,7 @@
 #ifndef mozilla_css_ErrorReporter_h_
 #define mozilla_css_ErrorReporter_h_
 
-#include "nsStringFwd.h"
+#include "nsString.h"
 
 struct nsCSSToken;
 class nsIDocument;