chromeos: Remove UpdateLibrary code, which is no longer used.

chrome/browser/chromeos/cros/mock_update_library.cc

Index: chrome/browser/chromeos/cros/mock_update_library.cc
diff --git a/chrome/browser/chromeos/cros/mock_update_library.cc b/chrome/browser/chromeos/cros/mock_update_library.cc
deleted file mode 100644
index 2049969b6a60c0992be1b2abdda5d3f76e29b7a1..0000000000000000000000000000000000000000
--- a/chrome/browser/chromeos/cros/mock_update_library.cc
+++ /dev/null
@@ -1,13 +0,0 @@
-// Copyright (c) 2010 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/chromeos/cros/mock_update_library.h"
-
-namespace chromeos {
-
-MockUpdateLibrary::MockUpdateLibrary() {}
-
-MockUpdateLibrary::~MockUpdateLibrary() {}
-
-}  // namespace chromeos