FileURLToFilePath: Don't unescape '/' and '\\'.

net/base/filename_util.cc

 // 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 "net/base/filename_util.h"
 
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/path_service.h"
 #include "base/strings/string_util.h"
@@ skipping 80 matching lines @@
   // TODO(dhg): This should probably take into account UNCs which could
   // include a hostname other than localhost or blank
   std::string path = url.path();
 #endif  // !defined(OS_WIN)
 
   if (path.empty())
     return false;
 
   // GURL stores strings as percent-encoded 8-bit, this will undo if possible.
   path = UnescapeURLComponent(
-      path, UnescapeRule::SPACES | UnescapeRule::URL_SPECIAL_CHARS);
+      path, UnescapeRule::SPACES |
+                UnescapeRule::URL_SPECIAL_CHARS_EXCEPT_PATH_SEPARATORS);
 
 #if defined(OS_WIN)
   if (base::IsStringUTF8(path)) {
     file_path_str.assign(base::UTF8ToWide(path));
     // We used to try too hard and see if |path| made up entirely of
     // the 1st 256 characters in the Unicode was a zero-extended UTF-16.
     // If so, we converted it to 'Latin-1' and checked if the result was UTF-8.
     // If the check passed, we converted the result to UTF-8.
     // Otherwise, we treated the result as the native OS encoding.
     // However, that led to http://crbug.com/4619 and http://crbug.com/14153
@@ skipping 74 matching lines @@
 
   for (size_t i = 0; i < arraysize(magic_names); ++i) {
     if (filename_lower == magic_names[i])
       return true;
   }
 
   return false;
 }
 
 }  // namespace net