Three way experiment for "Show saved copy" button.

chrome/common/localized_error.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 CHROME_COMMON_LOCALIZED_ERROR_H_
 #define CHROME_COMMON_LOCALIZED_ERROR_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 19 matching lines @@
 }
 
 class LocalizedError {
  public:
   // Fills |error_strings| with values to be used to build an error page used
   // on HTTP errors, like 404 or connection reset.
   static void GetStrings(int error_code,
                          const std::string& error_domain,
                          const GURL& failed_url,
                          bool is_post,
-                         bool show_stale_load_button,
+                         bool stale_copy_in_cache,
                          const std::string& locale,
                          const std::string& accept_languages,
                          scoped_ptr<error_page::ErrorPageParams> params,
                          base::DictionaryValue* strings);
 
   // Returns a description of the encountered error.
   static base::string16 GetErrorDetails(const blink::WebURLError& error,
                                         bool is_post);
 
   // Returns true if an error page exists for the specified parameters.
@@ skipping 10 matching lines @@
                                  base::DictionaryValue* error_strings);
 #endif
 
   static const char kHttpErrorDomain[];
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(LocalizedError);
 };
 
 #endif  // CHROME_COMMON_LOCALIZED_ERROR_H_