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

chrome/renderer/net/net_error_page_controller.cc

Index: chrome/renderer/net/net_error_page_controller.cc
diff --git a/chrome/renderer/net/net_error_page_controller.cc b/chrome/renderer/net/net_error_page_controller.cc
index f9a2ed38989c2844089adcb94a02dcfe3e71cc23..93eb07c03e787043350e74852a3744fa536f06aa 100644
--- a/chrome/renderer/net/net_error_page_controller.cc
+++ b/chrome/renderer/net/net_error_page_controller.cc
@@ -43,8 +43,12 @@ bool NetErrorPageController::ShowSavedCopyButtonClick() {
   return ButtonClick(error_page::NetErrorHelperCore::SHOW_SAVED_COPY_BUTTON);
 }
 
-bool NetErrorPageController::ShowSavedPagesButtonClick() {
-  return ButtonClick(error_page::NetErrorHelperCore::SHOW_SAVED_PAGES_BUTTON);
+bool NetErrorPageController::ShowOfflinePagesButtonClick() {
+  return ButtonClick(error_page::NetErrorHelperCore::SHOW_OFFLINE_PAGES_BUTTON);
+}
+
+bool NetErrorPageController::ShowOfflineCopyButtonClick() {
+  return ButtonClick(error_page::NetErrorHelperCore::SHOW_OFFLINE_COPY_BUTTON);
 }
 
 bool NetErrorPageController::ReloadButtonClick() {
@@ -96,8 +100,10 @@ gin::ObjectTemplateBuilder NetErrorPageController::GetObjectTemplateBuilder(
              isolate)
       .SetMethod("showSavedCopyButtonClick",
                  &NetErrorPageController::ShowSavedCopyButtonClick)
-      .SetMethod("showSavedPagesButtonClick",
-                 &NetErrorPageController::ShowSavedPagesButtonClick)
+      .SetMethod("showOfflinePagesButtonClick",
+                 &NetErrorPageController::ShowOfflinePagesButtonClick)
+      .SetMethod("showOfflineCopyButtonClick",
+                 &NetErrorPageController::ShowOfflineCopyButtonClick)
       .SetMethod("reloadButtonClick",
                  &NetErrorPageController::ReloadButtonClick)
       .SetMethod("detailsButtonClick",