Add missing using declarations in cronet code.

components/cronet/android/test/mock_cert_verifier.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 "mock_cert_verifier.h"
 
 #include <string>
 #include <vector>
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
 #include "base/android/jni_string.h"
 #include "base/test/test_support_android.h"
 #include "crypto/sha2.h"
 #include "jni/MockCertVerifier_jni.h"
 #include "net/base/net_errors.h"
 #include "net/cert/asn1_util.h"
 #include "net/cert/cert_verifier.h"
 #include "net/cert/cert_verify_result.h"
 #include "net/cert/mock_cert_verifier.h"
 #include "net/test/cert_test_util.h"
 #include "net/test/test_data_directory.h"
 
+using base::android::JavaParamRef;
+
 namespace cronet {
 
 namespace {
 
 // Populates |out_hash_value| with the SHA256 hash of the |cert| public key.
 // Returns true on success.
 static bool CalculatePublicKeySha256(const net::X509Certificate& cert,
                                      net::HashValue* out_hash_value) {
   // Convert the cert to DER encoded bytes.
   std::string der_cert_bytes;
@@ skipping 49 matching lines @@
   }
 
   return reinterpret_cast<jlong>(mock_cert_verifier);
 }
 
 bool RegisterMockCertVerifier(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace cronet