Escaping file names correctly. Also fixed a crush in chromeos debug build while saving a web page.

net/base/escape.h

 // Copyright (c) 2011 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 NET_BASE_ESCAPE_H_
 #define NET_BASE_ESCAPE_H_
 #pragma once
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/string16.h"
 #include "net/base/net_api.h"
 
 // Escaping --------------------------------------------------------------------
 
 // Escape a file.  This includes:
 // non-printable, non-7bit, and (including space)  "#%:<>?[\]^`{|}
 NET_API std::string EscapePath(const std::string& path);
 
 // Escape application/x-www-form-urlencoded content.  This includes:
 // non-printable, non-7bit, and (including space)  ?>=<;+'&%$#"![\]^`{|}
-// Space is escaped as + and other special characters as %XX (hex).
-NET_API std::string EscapeUrlEncodedData(const std::string& path);
+// Space is escaped as + (if use_plus is true) and other special characters
+// as %XX (hex).
+NET_API std::string EscapeUrlEncodedData(const std::string& path,
+                                         bool use_plus);
 
 // Escape all non-ASCII input.
 NET_API std::string EscapeNonASCII(const std::string& input);
 
 // Escapes characters in text suitable for use as an external protocol handler
 // command.
 // We %XX everything except alphanumerics and %-_.!~*'() and the restricted
 // chracters (;/?:@&=+$,).
 NET_API std::string EscapeExternalHandlerValue(const std::string& text);
 
@@ skipping 108 matching lines @@
 struct NET_TEST AdjustEncodingOffset {
   typedef std::vector<size_t> Adjustments;
 
   explicit AdjustEncodingOffset(const Adjustments& adjustments);
   void operator()(size_t& offset);
 
   const Adjustments& adjustments;
 };
 
 #endif  // NET_BASE_ESCAPE_H_