Fix tab restore for view-source Chrome extension pages (Merge to M58).

chrome/browser/chrome_content_browser_client.cc

Index: chrome/browser/chrome_content_browser_client.cc
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index fdbdd56d53ab76ff3b3acc53c2e3037babbc6b2a..5807d15120680a79259ad8c80de8b5e7a15f8892 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -1315,6 +1315,15 @@ void ChromeContentBrowserClient::GetAdditionalWebUISchemes(
   additional_schemes->push_back(dom_distiller::kDomDistillerScheme);
 }
 
+void ChromeContentBrowserClient::GetAdditionalViewSourceSchemes(
+    std::vector<std::string>* additional_schemes) {
+  GetAdditionalWebUISchemes(additional_schemes);
+
+#if BUILDFLAG(ENABLE_EXTENSIONS)
+  additional_schemes->push_back(extensions::kExtensionScheme);
+#endif
+}
+
 bool ChromeContentBrowserClient::LogWebUIUrl(const GURL& web_ui_url) const {
   return webui::LogWebUIUrl(web_ui_url);
 }