Add missing using statements for JNI types.

content/browser/time_zone_monitor_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 "content/browser/time_zone_monitor_android.h"
 
 #include "base/android/context_utils.h"
 #include "base/android/jni_android.h"
 #include "jni/TimeZoneMonitor_jni.h"
 
+using base::android::JavaParamRef;
+
 namespace content {
 
 TimeZoneMonitorAndroid::TimeZoneMonitorAndroid() : TimeZoneMonitor() {
   impl_.Reset(Java_TimeZoneMonitor_getInstance(
       base::android::AttachCurrentThread(),
       base::android::GetApplicationContext(),
       reinterpret_cast<intptr_t>(this)));
 }
 
 TimeZoneMonitorAndroid::~TimeZoneMonitorAndroid() {
@@ skipping 10 matching lines @@
     const JavaParamRef<jobject>& caller) {
   NotifyRenderers();
 }
 
 // static
 std::unique_ptr<TimeZoneMonitor> TimeZoneMonitor::Create() {
   return std::unique_ptr<TimeZoneMonitor>(new TimeZoneMonitorAndroid());
 }
 
 }  // namespace content