Chromium side patch for DB support on Linux.

base/platform_file_win.cc

 // Copyright (c) 2006-2008 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 "base/platform_file.h"
 
 #include "base/logging.h"
 
 namespace base {
 
@@ skipping 47 matching lines @@
                            create_flags, NULL);
 
   if ((flags & PLATFORM_FILE_OPEN_ALWAYS) && created &&
       INVALID_HANDLE_VALUE != file) {
     *created = (ERROR_ALREADY_EXISTS != GetLastError());
   }
 
   return file;
 }
 
+bool ClosePlatformFile(PlatformFile file) {
+  return (CloseHandle(file) == 0);
+}
+
 }  // namespace disk_cache