Remove base::Value::CreateNullValue

chrome/browser/ui/webui/media_router/media_router_webui_message_handler.cc

 // Copyright 2015 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 "chrome/browser/ui/webui/media_router/media_router_webui_message_handler.h"
 
 #include <string>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 268 matching lines @@
   if (route) {
     int current_cast_mode = CurrentCastModeForRouteId(
         route->media_route_id(), media_router_ui_->routes_and_cast_modes());
     std::unique_ptr<base::DictionaryValue> route_value(RouteToValue(
         *route, false, media_router_ui_->GetRouteProviderExtensionId(),
         incognito_, current_cast_mode));
     web_ui()->CallJavascriptFunctionUnsafe(kOnCreateRouteResponseReceived,
                                            base::Value(sink_id), *route_value,
                                            base::Value(route->for_display()));
   } else {
-    web_ui()->CallJavascriptFunctionUnsafe(
-        kOnCreateRouteResponseReceived, base::Value(sink_id),
-        *base::Value::CreateNullValue(), base::Value(false));
+    web_ui()->CallJavascriptFunctionUnsafe(kOnCreateRouteResponseReceived,
+                                           base::Value(sink_id), base::Value(),
+                                           base::Value(false));
   }
 }
 
 void MediaRouterWebUIMessageHandler::ReturnSearchResult(
     const std::string& sink_id) {
   DVLOG(2) << "ReturnSearchResult";
   web_ui()->CallJavascriptFunctionUnsafe(kReceiveSearchResult,
                                          base::Value(sink_id));
 }
 
 void MediaRouterWebUIMessageHandler::UpdateIssue(const Issue& issue) {
   DVLOG(2) << "UpdateIssue";
   web_ui()->CallJavascriptFunctionUnsafe(kSetIssue, *IssueToValue(issue));
 }
 
 void MediaRouterWebUIMessageHandler::ClearIssue() {
   DVLOG(2) << "ClearIssue";
-  web_ui()->CallJavascriptFunctionUnsafe(kSetIssue,
-                                         *base::Value::CreateNullValue());
+  web_ui()->CallJavascriptFunctionUnsafe(kSetIssue, base::Value());
 }
 
 void MediaRouterWebUIMessageHandler::UpdateMaxDialogHeight(int height) {
   DVLOG(2) << "UpdateMaxDialogHeight";
   web_ui()->CallJavascriptFunctionUnsafe(kUpdateMaxHeight, base::Value(height));
 }
 
 void MediaRouterWebUIMessageHandler::RegisterMessages() {
   web_ui()->RegisterMessageCallback(
       kRequestInitialData,
@@ skipping 574 matching lines @@
   }
 
   return value;
 }
 
 void MediaRouterWebUIMessageHandler::SetWebUIForTest(content::WebUI* web_ui) {
   set_web_ui(web_ui);
 }
 
 }  // namespace media_router