Move {Resolve|Reject}JavascriptCallback helpers in WebUIMessageHandler.

content/browser/webui/web_ui_message_handler.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/public/browser/web_ui_message_handler.h"
 
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
@@ skipping 55 matching lines @@
   if (value->GetString(0, &string16_value))
     return string16_value;
   NOTREACHED();
   return base::string16();
 }
 
 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