Make CertificateHandler a proper interface of CertificateImporter.

chromeos/network/mock_certificate_handler.cc

Index: chromeos/network/mock_certificate_handler.cc
diff --git a/chromeos/network/mock_certificate_handler.cc b/chromeos/network/mock_certificate_handler.cc
deleted file mode 100644
index 8ff080f56ef0947fced48cc9efd98d8faa34e0d0..0000000000000000000000000000000000000000
--- a/chromeos/network/mock_certificate_handler.cc
+++ /dev/null
@@ -1,15 +0,0 @@
-// Copyright (c) 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 "chromeos/network/mock_certificate_handler.h"
-
-namespace chromeos {
-
-MockCertificateHandler::MockCertificateHandler() {
-}
-
-MockCertificateHandler::~MockCertificateHandler() {
-}
-
-}  // namespace chromeos