change static_cast to NSCAP_STATIC_CAST

netwerk/protocol/http/src/nsHTTPChannel.cpp

@@ -815,8 +815,8 @@ nsHTTPChannel::Authenticate(const char *iChallenge, nsIChannel **oChannel)
 	// change this later to include other kinds of authentication. TODO 
     if (NS_FAILED(rv = nsBasicAuth::Authenticate(
                         mURI, 
-                        static_cast<const char*>(iChallenge), 
-                        static_cast<const char*>(newUserPass),
+                        NSCAP_STATIC_CAST(const char*, iChallenge), 
+                        NSCAP_STATIC_CAST(const char*, newUserPass),
                         getter_Copies(authString))))
         return rv; // Failed to construct an authentication string.