Add FilePath::FinalExtension() to avoid double extensions (.tar.gz) for file selector

chrome/browser/download/download_extensions.cc

 // 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.
 
 #include <set>
 #include <string>
 
 #include "chrome/browser/download/download_extensions.h"
 
 #include "base/strings/string_util.h"
@@ skipping 148 matching lines @@
   { "prg", ALLOW_ON_USER_GESTURE },
   { "pst", ALLOW_ON_USER_GESTURE },
   { "reg", ALLOW_ON_USER_GESTURE },
   { "scf", ALLOW_ON_USER_GESTURE },
   { "scr", ALLOW_ON_USER_GESTURE },
   { "sct", ALLOW_ON_USER_GESTURE },
   { "shb", ALLOW_ON_USER_GESTURE },
   { "shs", ALLOW_ON_USER_GESTURE },
   { "sys", DANGEROUS },
   { "url", ALLOW_ON_USER_GESTURE },
-  // TODO(davidben): Remove this when double-extensions are no longer
-  // a nuisance.
-  { "user.js", ALLOW_ON_USER_GESTURE },
   { "vb", ALLOW_ON_USER_GESTURE },
   { "vbe", ALLOW_ON_USER_GESTURE },
   { "vbs", ALLOW_ON_USER_GESTURE },
   { "vsd", ALLOW_ON_USER_GESTURE },
   { "vsmacros", ALLOW_ON_USER_GESTURE },
   { "vss", ALLOW_ON_USER_GESTURE },
   { "vst", ALLOW_ON_USER_GESTURE },
   { "vsw", ALLOW_ON_USER_GESTURE },
   { "ws", ALLOW_ON_USER_GESTURE },
   { "wsc", ALLOW_ON_USER_GESTURE },
@@ skipping 22 matching lines @@
   { "exe", ALLOW_ON_USER_GESTURE },
   { "ksh", ALLOW_ON_USER_GESTURE },
   { "rpm", ALLOW_ON_USER_GESTURE },
   { "sh", ALLOW_ON_USER_GESTURE },
   { "shar", ALLOW_ON_USER_GESTURE },
   { "tcsh", ALLOW_ON_USER_GESTURE },
 #endif
 };
 
 DownloadDangerLevel GetFileDangerLevel(const base::FilePath& path) {
-  base::FilePath::StringType extension(path.Extension());
+  base::FilePath::StringType extension(path.FinalExtension());
   if (extension.empty())
     return NOT_DANGEROUS;
   if (!IsStringASCII(extension))
     return NOT_DANGEROUS;
 #if defined(OS_WIN)
   std::string ascii_extension = WideToASCII(extension);
 #elif defined(OS_POSIX)
   std::string ascii_extension = extension;
 #endif
 
@@ skipping 36 matching lines @@
   for (size_t i = 0; i < arraysize(kExecutableBlackList); ++i) {
     if (net::MatchesMimeType(kExecutableBlackList[i], mime_type))
       return false;
   }
   // We consider only other application types to be executable.
   return net::MatchesMimeType("application/*", mime_type);
 }
 
 
 }  // namespace download_util