Add missing using statements for JNI types.

chrome/browser/android/rlz/revenue_stats.cc

 // Copyright 2015 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 "chrome/browser/android/rlz/revenue_stats.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "chrome/browser/search_engines/ui_thread_search_terms_data_android.h"
 #include "jni/RevenueStats_jni.h"
 #include "url/gurl.h"
 
+using base::android::JavaParamRef;
+
 namespace chrome {
 namespace android {
 
 // Register native methods
 bool RegisterRevenueStats(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 static void SetSearchClient(JNIEnv* env,
                             const JavaParamRef<jclass>& clazz,
                             const JavaParamRef<jstring>& jclient) {
   SearchTermsDataAndroid::search_client_.Get() =
       base::android::ConvertJavaStringToUTF8(env, jclient);
 }
 
 static void SetRlzParameterValue(JNIEnv* env,
                                  const JavaParamRef<jclass>& clazz,
                                  const JavaParamRef<jstring>& jrlz) {
   SearchTermsDataAndroid::rlz_parameter_value_.Get() =
       base::android::ConvertJavaStringToUTF16(env, jrlz);
 }
 
 }  // namespace android
 }  // namespace chrome