Enable "Hide Extension" option when "Save Link As" on the Mac

content/browser/download/base_file.h

 // Copyright (c) 2012 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.
 
 #ifndef CONTENT_BROWSER_DOWNLOAD_BASE_FILE_H_
 #define CONTENT_BROWSER_DOWNLOAD_BASE_FILE_H_
 
 #include <string>
 
 #include "base/files/file.h"
@@ skipping 89 matching lines @@
   // Returns the current (intermediate) state of the hash as a byte string.
   virtual std::string GetHashState();
 
   // Returns true if the given hash is considered empty.  An empty hash is
   // a string of size crypto::kSHA256Length that contains only zeros (initial
   // value for the hash).
   static bool IsEmptyHash(const std::string& hash);
 
   virtual std::string DebugString() const;
 
+  // Sets whether the BaseFile should hide its file extension when presented in
+  // the Finder (MacOSX).
+  void set_hide_file_extension(bool hide_file_extension);
+
  private:
   friend class BaseFileTest;
   FRIEND_TEST_ALL_PREFIXES(BaseFileTest, IsEmptyHash);
 
   // Creates and opens the file_ if it is NULL.
   DownloadInterruptReason Open();
 
   // Closes and resets file_.
   void Close();
 
@@ skipping 54 matching lines @@
   scoped_ptr<crypto::SecureHash> secure_hash_;
 
   unsigned char sha256_hash_[crypto::kSHA256Length];
 
   // Indicates that this class no longer owns the associated file, and so
   // won't delete it on destruction.
   bool detached_;
 
   net::BoundNetLog bound_net_log_;
 
+  bool hide_file_extension_;
+
   DISALLOW_COPY_AND_ASSIGN(BaseFile);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_BASE_FILE_H_