Three way experiment for "Show saved copy" button.

chrome/renderer/net/net_error_helper.h

Index: chrome/renderer/net/net_error_helper.h
diff --git a/chrome/renderer/net/net_error_helper.h b/chrome/renderer/net/net_error_helper.h
index b82ec7a89308aa0ebbf2e01a41faddac1a23001f..e31ce5ed9ba5dcba03c34460e68d32f5878be1a7 100644
--- a/chrome/renderer/net/net_error_helper.h
+++ b/chrome/renderer/net/net_error_helper.h
@@ -45,7 +45,7 @@ class NetErrorHelper
 
   // Button press notification from error page.
   void ReloadButtonPressed();
-  void LoadStaleButtonPressed();
+  void ShowSavedCopyButtonPressed();
   void MoreButtonPressed();
 
   // RenderFrameObserver implementation.
@@ -89,7 +89,7 @@ class NetErrorHelper
       bool is_failed_post,
       scoped_ptr<error_page::ErrorPageParams> params,
       bool* reload_button_shown,
-      bool* load_stale_button_shown,
+      bool* show_saved_copy_button_shown,
       std::string* html) const override;
   void LoadErrorPageInMainFrame(const std::string& html,
                                 const GURL& failed_url) override;