[update_engine] Update to use not-hideously-old logging API from chrome

mock_http_fetcher.h

 // Copyright (c) 2009 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROMEOS_PLATFORM_UPDATE_ENGINE_MOCK_HTTP_FETCHER_H__
 #define CHROMEOS_PLATFORM_UPDATE_ENGINE_MOCK_HTTP_FETCHER_H__
 
 #include <vector>
 #include <glib.h>
-#include "chromeos/obsolete_logging.h"
+#include "base/logging.h"
 #include "update_engine/http_fetcher.h"
 
 // This is a mock implementation of HttpFetcher which is useful for testing.
 // All data must be passed into the ctor. When started, MockHttpFetcher will
 // deliver the data in chunks of size kMockHttpFetcherChunkSize. To simulate
 // a network failure, you can call FailTransfer().
 
 namespace chromeos_update_engine {
 
 // MockHttpFetcher will send a chunk of data down in each call to BeginTransfer
@@ skipping 63 matching lines @@
 
   // True iff the fetcher is paused.
   bool paused_;
 
   DISALLOW_COPY_AND_ASSIGN(MockHttpFetcher);
 };
 
 }  // namespace chromeos_update_engine
 
 #endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_MOCK_HTTP_FETCHER_H__