Replace free isnan with std::isnan

chrome/browser/ui/webui/engagement/site_engagement_ui.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/engagement/site_engagement_ui.h"
 
 #include <cmath>
 #include <utility>
 
 #include "base/macros.h"
@@ skipping 37 matching lines @@
       engagement_info.push_back(std::move(origin_info));
     }
 
     callback.Run(std::move(engagement_info));
   }
 
   void SetSiteEngagementScoreForOrigin(const mojo::String& origin,
                                        double score) override {
     GURL origin_gurl(origin.get());
     if (!origin_gurl.is_valid() || score < 0 ||
-        score > SiteEngagementScore::kMaxPoints || isnan(score)) {
+        score > SiteEngagementScore::kMaxPoints || std::isnan(score)) {
       return;
     }
 
     SiteEngagementService* service = SiteEngagementService::Get(profile_);
     service->ResetScoreForURL(origin_gurl, score);
   }
 
  private:
   // The Profile* handed to us in our constructor.
   Profile* profile_;
@@ skipping 23 matching lines @@
     content::WebUIDataSource::Add(profile, source.release());
 }
 
 SiteEngagementUI::~SiteEngagementUI() {}
 
 void SiteEngagementUI::BindUIHandler(
     mojo::InterfaceRequest<SiteEngagementUIHandler> request) {
   ui_handler_.reset(new SiteEngagementUIHandlerImpl(
       Profile::FromWebUI(web_ui()), std::move(request)));
 }