jni_generator: Pass object parameters as JavaParamRef.

chrome/browser/android/warmup_manager.cc

Index: chrome/browser/android/warmup_manager.cc
diff --git a/chrome/browser/android/warmup_manager.cc b/chrome/browser/android/warmup_manager.cc
index b5d82b62f82969102d7e23119d5e78c167ecf5cb..0c7956a346e99283e944d2253f64f0eeef8685d1 100644
--- a/chrome/browser/android/warmup_manager.cc
+++ b/chrome/browser/android/warmup_manager.cc
@@ -12,9 +12,10 @@
 #include "jni/WarmupManager_jni.h"
 #include "url/gurl.h"
 
-
-static void PreconnectUrlAndSubresources(JNIEnv* env, jclass clazz,
-                                         jobject jprofile, jstring url_str) {
+static void PreconnectUrlAndSubresources(JNIEnv* env,
+                                         const JavaParamRef<jclass>& clazz,
+                                         const JavaParamRef<jobject>& jprofile,
+                                         const JavaParamRef<jstring>& url_str) {
   if (url_str) {
     GURL url = GURL(base::android::ConvertJavaStringToUTF8(env, url_str));
     Profile* profile = ProfileAndroid::FromProfileAndroid(jprofile);