jni_generator: Pass object parameters as JavaParamRef.

components/variations/android/variations_associated_data_android.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/variations/android/variations_associated_data_android.h"
 
 #include <string>
 
 #include "base/android/jni_string.h"
 #include "components/variations/variations_associated_data.h"
 #include "jni/VariationsAssociatedData_jni.h"
 
 using base::android::ConvertJavaStringToUTF8;
 using base::android::ConvertUTF8ToJavaString;
 
 namespace variations {
 
 namespace android {
 
-ScopedJavaLocalRef<jstring> GetVariationParamValue(JNIEnv* env,
-                                                   jclass clazz,
-                                                   jstring jtrial_name,
-                                                   jstring jparam_name) {
+ScopedJavaLocalRef<jstring> GetVariationParamValue(
+    JNIEnv* env,
+    const JavaParamRef<jclass>& clazz,
+    const JavaParamRef<jstring>& jtrial_name,
+    const JavaParamRef<jstring>& jparam_name) {
   std::string trial_name(ConvertJavaStringToUTF8(env, jtrial_name));
   std::string param_name(ConvertJavaStringToUTF8(env, jparam_name));
   std::string param_value =
       variations::GetVariationParamValue(trial_name, param_name);
   return ConvertUTF8ToJavaString(env, param_value);
 }
 
 bool RegisterVariationsAssociatedData(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace android
 
 }  // namespace variations