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

net/base/escape.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 "net/base/escape.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 272 matching lines @@
         }
       }
 
       if (first_byte >= 0x80 ||  // Unescape all high-bit characters.
           // For 7-bit characters, the lookup table tells us all valid chars.
           (kUrlUnescape[first_byte] ||
            // ...and we allow some additional unescaping when flags are set.
            (first_byte == ' ' && (rules & UnescapeRule::SPACES)) ||
            // Allow any of the prohibited but non-control characters when
            // we're doing "special" chars.
-           (first_byte > ' ' && (rules & UnescapeRule::URL_SPECIAL_CHARS)) ||
+           ((first_byte == '/' || first_byte == '\\') &&
+            (rules & UnescapeRule::PATH_SEPARATORS)) ||
+           (first_byte > ' ' && first_byte != '/' && first_byte != '\\' &&
+            (rules & UnescapeRule::URL_SPECIAL_CHARS_EXCEPT_PATH_SEPARATORS)) ||
            // Additionally allow non-display characters if requested.
            (first_byte < ' ' &&
             (rules & UnescapeRule::SPOOFING_AND_CONTROL_CHARS)))) {
         // Use the unescaped version of the character.
         if (adjustments)
           adjustments->push_back(base::OffsetAdjuster::Adjustment(i, 3, 1));
         result.push_back(first_byte);
         i += 2;
       } else {
         // Keep escaped. Append a percent and we'll get the following two
@@ skipping 197 matching lines @@
                        1, kEscapeToChars[i].replacement);
           break;
         }
       }
     }
   }
   return text;
 }
 
 }  // namespace net