Add missing using declarations in cronet code.

components/cronet/android/chromium_url_request_context.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 "components/cronet/android/chromium_url_request_context.h"
 
 #include <memory>
 #include <string>
 #include <utility>
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "base/json/json_reader.h"
 #include "base/logging.h"
 #include "base/metrics/statistics_recorder.h"
 #include "base/values.h"
 #include "components/cronet/android/chromium_url_request.h"
 #include "components/cronet/android/url_request_adapter.h"
 #include "components/cronet/android/url_request_context_adapter.h"
 #include "components/cronet/url_request_context_config.h"
 #include "jni/ChromiumUrlRequestContext_jni.h"
 
 using base::android::ConvertUTF8ToJavaString;
 using base::android::ConvertJavaStringToUTF8;
+using base::android::JavaParamRef;
+using base::android::ScopedJavaLocalRef;
 
 namespace {
 
 // Delegate of URLRequestContextAdapter that delivers callbacks to the Java
 // layer.
 class JniURLRequestContextAdapterDelegate
     : public cronet::URLRequestContextAdapter::
           URLRequestContextAdapterDelegate {
  public:
   JniURLRequestContextAdapterDelegate(JNIEnv* env, jobject owner)
@@ skipping 105 matching lines @@
 // Called on application's main Java thread.
 static void InitRequestContextOnMainThread(JNIEnv* env,
                                            const JavaParamRef<jobject>& jcaller,
                                            jlong jurl_request_context_adapter) {
   URLRequestContextAdapter* context_adapter =
       reinterpret_cast<URLRequestContextAdapter*>(jurl_request_context_adapter);
   context_adapter->InitRequestContextOnMainThread();
 }
 
 }  // namespace cronet