Make the new WebUI's code handle all webui schemes, instead of just chrome://.

content/browser/webui/url_data_manager_backend.cc

Index: content/browser/webui/url_data_manager_backend.cc
diff --git a/content/browser/webui/url_data_manager_backend.cc b/content/browser/webui/url_data_manager_backend.cc
index 861261846dd40bea82ad27dd6746a429dbb738f8..d2e6f4b0d53e491ed20bbd8d697b662390520313 100644
--- a/content/browser/webui/url_data_manager_backend.cc
+++ b/content/browser/webui/url_data_manager_backend.cc
@@ -700,6 +700,13 @@ void URLDataManagerBackend::URLToRequestPath(const GURL& url,
     path->assign(spec.substr(offset));
 }
 
+std::vector<std::string> URLDataManagerBackend::GetWebUISchemes() {
+  std::vector<std::string> schemes;
+  schemes.push_back(kChromeUIScheme);
+  GetContentClient()->browser()->GetAdditionalWebUISchemes(&schemes);
+  return schemes;
+}
+
 namespace {
 
 class DevToolsJobFactory