jni_generator: Pass object parameters as JavaParamRef.

chromecast/android/cast_metrics_helper_android.cc

Index: chromecast/android/cast_metrics_helper_android.cc
diff --git a/chromecast/android/cast_metrics_helper_android.cc b/chromecast/android/cast_metrics_helper_android.cc
index 62530bd02241feedb7471e9e6967ed63265fe4b8..439303f980b23c2bea8edd151c01e4d618bc510a 100644
--- a/chromecast/android/cast_metrics_helper_android.cc
+++ b/chromecast/android/cast_metrics_helper_android.cc
@@ -14,11 +14,11 @@ bool CastMetricsHelperAndroid::RegisterJni(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
-void LogMediaPlay(JNIEnv* env, jclass clazz) {
+void LogMediaPlay(JNIEnv* env, const JavaParamRef<jclass>& clazz) {
   metrics::CastMetricsHelper::GetInstance()->LogMediaPlay();
 }
 
-void LogMediaPause(JNIEnv* env, jclass clazz) {
+void LogMediaPause(JNIEnv* env, const JavaParamRef<jclass>& clazz) {
   metrics::CastMetricsHelper::GetInstance()->LogMediaPause();
 }