Work around bustage. Temporary fix. b=223041

caps/src/nsPrincipal.cpp

@@ -149,7 +149,7 @@ nsPrincipal::GetJsPrincipals(JSPrincipals **jsprin)
 
   // JSPRINCIPALS_HOLD does not use its first argument.
   // Just use a dummy cx to save the codesize.
-  JSPRINCIPALS_HOLD(cx, *jsprin);
+  JSPRINCIPALS_HOLD(nsnull, *jsprin);
 
   return NS_OK;
 }

caps/src/nsSystemPrincipal.cpp

@@ -233,7 +233,7 @@ nsSystemPrincipal::GetJsPrincipals(JSPrincipals **jsprin)
     NS_PRECONDITION(mJSPrincipals.nsIPrincipalPtr, "mJSPrincipals is uninitalized!");
 
     *jsprin = &mJSPrincipals;
-    JSPRINCIPALS_HOLD(cx, *jsprin);
+    JSPRINCIPALS_HOLD(nsnull, *jsprin);
     return NS_OK;
 }