Add missing using declarations in cronet code.

components/cronet/android/test/cronet_url_request_context_config_test.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 "cronet_url_request_context_config_test.h"
 
 #include <jni.h>
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "base/android/scoped_java_ref.h"
 #include "base/logging.h"
 #include "components/cronet/url_request_context_config.h"
 #include "components/cronet/version.h"
 #include "jni/CronetUrlRequestContextTest_jni.h"
 
+using base::android::JavaParamRef;
+
 namespace cronet {
 
 // Verifies that all the configuration options set by
 // CronetUrlRequestContextTest.testCronetEngineBuilderConfig
 // made it from the CronetEngine.Builder to the URLRequestContextConfig.
 static void VerifyUrlRequestContextConfig(
     JNIEnv* env,
     const JavaParamRef<jclass>& jcaller,
     jlong jurl_request_context_config,
     const JavaParamRef<jstring>& jstorage_path) {
@@ skipping 21 matching lines @@
   CHECK_EQ(config->data_reduction_secure_proxy_check_url, "uvwx");
   CHECK_EQ(config->storage_path,
            base::android::ConvertJavaStringToUTF8(env, jstorage_path));
 }
 
 bool RegisterCronetUrlRequestContextConfigTest(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace cronet