Add missing using statements for JNI types.

chrome/browser/android/contextualsearch/contextual_search_tab_helper.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/contextualsearch/contextual_search_tab_helper.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/common/pref_names.h"
 #include "components/prefs/pref_change_registrar.h"
 #include "jni/ContextualSearchTabHelper_jni.h"
 
+using base::android::JavaParamRef;
+using base::android::ScopedJavaLocalRef;
 
 ContextualSearchTabHelper::ContextualSearchTabHelper(JNIEnv* env,
                                                      jobject obj,
                                                      Profile* profile)
     : weak_java_ref_(env, obj),
       pref_change_registrar_(new PrefChangeRegistrar()),
       weak_factory_(this) {
   pref_change_registrar_->Init(profile->GetPrefs());
   pref_change_registrar_->Add(
       prefs::kContextualSearchEnabled,
@@ skipping 22 matching lines @@
   Profile* profile = ProfileAndroid::FromProfileAndroid(java_profile);
   CHECK(profile);
   ContextualSearchTabHelper* tab = new ContextualSearchTabHelper(
       env, obj, profile);
   return reinterpret_cast<intptr_t>(tab);
 }
 
 bool RegisterContextualSearchTabHelper(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }