jni_generator: Pass object parameters as JavaParamRef.

chrome/browser/android/metrics/launch_metrics.cc

Index: chrome/browser/android/metrics/launch_metrics.cc
diff --git a/chrome/browser/android/metrics/launch_metrics.cc b/chrome/browser/android/metrics/launch_metrics.cc
index c5e3330c417cadc59f697c7a5919806f20772017..31686670b97f4020574c32ac05bf3129e8da8bf3 100644
--- a/chrome/browser/android/metrics/launch_metrics.cc
+++ b/chrome/browser/android/metrics/launch_metrics.cc
@@ -27,8 +27,12 @@ bool RegisterLaunchMetrics(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
-static void RecordLaunch(JNIEnv* env, jclass caller, jboolean standalone,
-                         jstring jurl, int source, jobject jweb_contents) {
+static void RecordLaunch(JNIEnv* env,
+                         const JavaParamRef<jclass>& caller,
+                         jboolean standalone,
+                         const JavaParamRef<jstring>& jurl,
+                         int source,
+                         const JavaParamRef<jobject>& jweb_contents) {
   GURL url(base::android::ConvertJavaStringToUTF8(env, jurl));
 
   content::WebContents* web_contents =