Disallow apps with the wrong content type header.

chrome/browser/history/download_types.h

 // 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.
 //
 // Download creation struct used for querying the history service.
 
 #ifndef CHROME_BROWSER_HISTORY_DOWNLOAD_TYPES_H_
 #define CHROME_BROWSER_HISTORY_DOWNLOAD_TYPES_H_
 
 #include <string>
@@ skipping 60 matching lines @@
   int64 received_bytes;
   int64 total_bytes;
   int32 state;
   int32 download_id;
   int child_id;
   int render_view_id;
   int request_id;
   int64 db_handle;
   std::string content_disposition;
   std::string mime_type;
+  // The value of the content type header sent with the downloaded item.  It
+  // may be different from |mime_type|, which may be set based on heuristics
+  // which may look at the file extension and first few bytes of the file.
+  std::string original_mime_type;
   bool save_as;
   // Whether this download is potentially dangerous (ex: exe, dll, ...).
   bool is_dangerous;
   // The original name for a dangerous download.
   FilePath original_name;
   // Whether this download is for extension install or not.
   bool is_extension_install;
   // The charset of the referring page where the download request comes from.
   // It's used to construct a suggested filename.
   std::string referrer_charset;
   // The download file save info.
   DownloadSaveInfo save_info;
 };
 
 #endif  // CHROME_BROWSER_HISTORY_DOWNLOAD_TYPES_H_