Change the copyright from Chromium OS to Chromium.

ui/file_manager/zip_archiver/cpp/volume.cc

-// Copyright 2014 The Chromium OS Authors. All rights reserved.
+// Copyright 2014 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 "volume.h"
 
 #include <cstring>
 #include <sstream>
 
 #include "request.h"
 #include "volume_archive_minizip.h"
@@ skipping 497 matching lines @@
   }
   volume_archive_->MaybeDecompressAhead();
 }
 
 
 void Volume::ClearJob() {
   job_lock_.Acquire();
   reader_request_id_ = "";
   job_lock_.Release();
 }