Add missing using statements for JNI types.

chrome/browser/prerender/external_prerender_handler_android.cc

 // Copyright 2013 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/prerender/external_prerender_handler_android.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "base/strings/string16.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/prerender/prerender_handle.h"
 #include "chrome/browser/prerender/prerender_manager.h"
 #include "chrome/browser/prerender/prerender_manager_factory.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_android.h"
 #include "content/public/browser/web_contents.h"
 #include "jni/ExternalPrerenderHandler_jni.h"
 #include "net/base/network_change_notifier.h"
 
 using base::android::ConvertJavaStringToUTF16;
+using base::android::JavaParamRef;
 
 namespace prerender {
 
 namespace {
 
 bool CheckAndConvertParams(JNIEnv* env,
                            const JavaParamRef<jobject>& jprofile,
                            const JavaParamRef<jstring>& jurl,
                            const JavaParamRef<jobject>& jweb_contents,
                            GURL* url,
@@ skipping 120 matching lines @@
       new ExternalPrerenderHandlerAndroid();
   return reinterpret_cast<intptr_t>(external_handler);
 }
 
 bool ExternalPrerenderHandlerAndroid::RegisterExternalPrerenderHandlerAndroid(
     JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace prerender