Add missing using statements for JNI types.

base/android/field_trial_list.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 "base/android/field_trial_list.h"
 
 #include <jni.h>
 
 #include "base/android/jni_string.h"
 #include "base/metrics/field_trial.h"
 #include "jni/FieldTrialList_jni.h"
 
 using base::android::ConvertJavaStringToUTF8;
 using base::android::ConvertUTF8ToJavaString;
+using base::android::JavaParamRef;
+using base::android::ScopedJavaLocalRef;
 
 static ScopedJavaLocalRef<jstring> FindFullName(
     JNIEnv* env,
     const JavaParamRef<jclass>& clazz,
     const JavaParamRef<jstring>& jtrial_name) {
   std::string trial_name(ConvertJavaStringToUTF8(env, jtrial_name));
   return ConvertUTF8ToJavaString(
       env, base::FieldTrialList::FindFullName(trial_name));
 }
 
 static jboolean TrialExists(JNIEnv* env,
                             const JavaParamRef<jclass>& clazz,
                             const JavaParamRef<jstring>& jtrial_name) {
   std::string trial_name(ConvertJavaStringToUTF8(env, jtrial_name));
   return base::FieldTrialList::TrialExists(trial_name);
 }
 
 namespace base {
 namespace android {
 
 bool RegisterFieldTrialList(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace android
 }  // namespace base