Add missing using statements for JNI types.

chrome/browser/android/signin/account_management_screen_helper.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 "chrome/browser/android/signin/account_management_screen_helper.h"
 
 #include "base/android/context_utils.h"
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_android.h"
 #include "chrome/browser/profiles/profile_metrics.h"
 #include "jni/AccountManagementScreenHelper_jni.h"
 
+using base::android::JavaParamRef;
+
 // static
 void AccountManagementScreenHelper::OpenAccountManagementScreen(
     Profile* profile,
     signin::GAIAServiceType service_type) {
   DCHECK(profile);
   DCHECK(ProfileAndroid::FromProfile(profile));
 
   Java_AccountManagementScreenHelper_openAccountManagementScreen(
       base::android::AttachCurrentThread(),
       base::android::GetApplicationContext(),
       ProfileAndroid::FromProfile(profile)->GetJavaObject().obj(),
       static_cast<int>(service_type));
 }
 
 static void LogEvent(JNIEnv* env,
                      const JavaParamRef<jclass>& clazz,
                      jint metric,
                      jint gaiaServiceType) {
   ProfileMetrics::LogProfileAndroidAccountManagementMenu(
       static_cast<ProfileMetrics::ProfileAndroidAccountManagementMenu>(metric),
       static_cast<signin::GAIAServiceType>(gaiaServiceType));
 }
 
 // static
 bool AccountManagementScreenHelper::Register(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }