Move {Resolve|Reject}JavascriptCallback helpers in WebUIMessageHandler.

content/browser/webui/web_ui_message_handler.cc

Index: content/browser/webui/web_ui_message_handler.cc
diff --git a/content/browser/webui/web_ui_message_handler.cc b/content/browser/webui/web_ui_message_handler.cc
index 56e0adcbbaa7a1919749123f767746c17f0069fa..41ca291e03e8ec768fab1e9de23d2dc3f05eca97 100644
--- a/content/browser/webui/web_ui_message_handler.cc
+++ b/content/browser/webui/web_ui_message_handler.cc
@@ -73,4 +73,20 @@ void WebUIMessageHandler::RenderViewReused() {
   DisallowJavascript();
 }
 
+void WebUIMessageHandler::ResolveJavascriptCallback(
+    const base::Value& callback_id,
+    const base::Value& response) {
+  // cr.webUIResponse is a global JS function exposed from cr.js.
+  CallJavascriptFunction("cr.webUIResponse", callback_id,
+                         base::FundamentalValue(true), response);
+}
+
+void WebUIMessageHandler::RejectJavascriptCallback(
+    const base::Value& callback_id,
+    const base::Value& response) {
+  // cr.webUIResponse is a global JS function exposed from cr.js.
+  CallJavascriptFunction("cr.webUIResponse", callback_id,
+                         base::FundamentalValue(false), response);
+}
+
 }  // namespace content