jni_generator: Pass object parameters as JavaParamRef.

components/cronet/android/test/network_change_notifier_util.cc

Index: components/cronet/android/test/network_change_notifier_util.cc
diff --git a/components/cronet/android/test/network_change_notifier_util.cc b/components/cronet/android/test/network_change_notifier_util.cc
index 07f41d724859ee8b0dbc2f70a1f372b55cf70eb4..b6444aa11967b808b92c74d7ee5b8bfd670872ce 100644
--- a/components/cronet/android/test/network_change_notifier_util.cc
+++ b/components/cronet/android/test/network_change_notifier_util.cc
@@ -45,7 +45,9 @@ class TestIPAddressObserver
 // Adds a TestIPAddressObserver to the list of IPAddressObservers, and returns
 // a boolean indicating whether the TestIPAddressObserver has received
 // notification when network changes.
-static jboolean IsTestIPAddressObserverCalled(JNIEnv* jenv, jclass jcaller) {
+static jboolean IsTestIPAddressObserverCalled(
+    JNIEnv* jenv,
+    const JavaParamRef<jclass>& jcaller) {
   // This method is called on a Java thread with no MessageLoop, but we need
   // one for the NetworkChangeNotifier to call the observer on.
   base::MessageLoop loop;