WebUI: Allow rejecting a promise that is returned from cr.sendWithPromise().

chrome/browser/ui/webui/settings/md_settings_ui.cc

Index: chrome/browser/ui/webui/settings/md_settings_ui.cc
diff --git a/chrome/browser/ui/webui/settings/md_settings_ui.cc b/chrome/browser/ui/webui/settings/md_settings_ui.cc
index edc6ef05f60be20be124ffe767cc3fb814853f96..fb799806ed5abf15040de99c299c52e93808a3ad 100644
--- a/chrome/browser/ui/webui/settings/md_settings_ui.cc
+++ b/chrome/browser/ui/webui/settings/md_settings_ui.cc
@@ -44,10 +44,22 @@ SettingsPageUIHandler::SettingsPageUIHandler() {
 SettingsPageUIHandler::~SettingsPageUIHandler() {
 }
 
-void SettingsPageUIHandler::CallJavascriptCallback(
-    const base::Value& callback_id, const base::Value& response) {
+void SettingsPageUIHandler::ResolveCallback(
+    const base::Value& callback_id,
+    const base::Value& response) {
   // cr.webUIResponse is a global JS function exposed from cr.js.
-  web_ui()->CallJavascriptFunction("cr.webUIResponse", callback_id, response);
+  web_ui()->CallJavascriptFunction(
+      "cr.webUIResponse", callback_id,
+      base::FundamentalValue(true), response);
+}
+
+void SettingsPageUIHandler::RejectCallback(
+    const base::Value& callback_id,
+    const base::Value& response) {
+  // cr.webUIResponse is a global JS function exposed from cr.js.
+  web_ui()->CallJavascriptFunction(
+      "cr.webUIResponse", callback_id,
+      base::FundamentalValue(false), response);
 }
 
 MdSettingsUI::MdSettingsUI(content::WebUI* web_ui)