Add missing using statements for JNI types.

chrome/browser/android/signin/account_tracker_service_android.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/signin/account_tracker_service_android.h"
 
 #include <stddef.h>
 
 #include "base/android/jni_array.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/signin/account_tracker_service_factory.h"
 #include "components/signin/core/browser/account_tracker_service.h"
 #include "jni/AccountTrackerService_jni.h"
 
+using base::android::JavaParamRef;
+
 namespace signin {
 namespace android {
 
 void SeedAccountsInfo(JNIEnv* env,
                       const JavaParamRef<jclass>& jcaller,
                       const JavaParamRef<jobjectArray>& gaiaIds,
                       const JavaParamRef<jobjectArray>& accountNames) {
   std::vector<std::string> gaia_ids;
   std::vector<std::string> account_names;
   base::android::AppendJavaStringArrayToStringVector(env, gaiaIds, &gaia_ids);
@@ skipping 11 matching lines @@
     account_tracker_service->SeedAccountInfo(gaia_ids[i], account_names[i]);
   }
 }
 
 bool RegisterAccountTrackerService(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace android
 }  // namespace signin