Add "Show saved copy" button in dino page when there's offline copy

chrome/renderer/net/net_error_page_controller.h

Index: chrome/renderer/net/net_error_page_controller.h
diff --git a/chrome/renderer/net/net_error_page_controller.h b/chrome/renderer/net/net_error_page_controller.h
index 95216cbfa3824aaa56c19a65de5eba03f357ba87..59dceb2cd8e8adac81d8abbbefe837cd767f0cbf 100644
--- a/chrome/renderer/net/net_error_page_controller.h
+++ b/chrome/renderer/net/net_error_page_controller.h
@@ -54,8 +54,11 @@ class NetErrorPageController : public gin::Wrappable<NetErrorPageController> {
   // Execute a "Show saved copy" button click.
   bool ShowSavedCopyButtonClick();
 
-  // Execute a "Show saved pages" button click.
-  bool ShowSavedPagesButtonClick();
+  // Execute a button click to show the list of all offline pages.
+  bool ShowOfflinePagesButtonClick();
+
+  // Execute a button click to show the offline copy of this page.
+  bool ShowOfflineCopyButtonClick();
 
   // Execute a "Reload" button click.
   bool ReloadButtonClick();