Add detailed histograms for DownloadProtectionService URLFetcher errors.

chrome/browser/ui/webui/net_internals/net_internals_ui.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 "chrome/browser/ui/webui/net_internals/net_internals_ui.h"
 
 #include <algorithm>
 #include <list>
 #include <string>
 #include <utility>
@@ skipping 171 matching lines @@
       break;
     case net::URLRequestStatus::IO_PENDING:
       dict->SetString("status", "IO_PENDING");
       break;
     case net::URLRequestStatus::CANCELED:
       dict->SetString("status", "CANCELED");
       break;
     case net::URLRequestStatus::FAILED:
       dict->SetString("status", "FAILED");
       break;
+    case net::URLRequestStatus::STATUS_MAX:
+      NOTREACHED();
+      break;
   }
   if (request->status().error() != net::OK)
     dict->SetInteger("net_error", request->status().error());
   return dict;
 }
 
 // Returns true if |request1| was created before |request2|.
 bool RequestCreatedBefore(const net::URLRequest* request1,
                           const net::URLRequest* request2) {
   return request1->creation_time() < request2->creation_time();
@@ skipping 1666 matching lines @@
 }
 
 NetInternalsUI::NetInternalsUI(content::WebUI* web_ui)
     : WebUIController(web_ui) {
   web_ui->AddMessageHandler(new NetInternalsMessageHandler());
 
   // Set up the chrome://net-internals/ source.
   Profile* profile = Profile::FromWebUI(web_ui);
   content::WebUIDataSource::Add(profile, CreateNetInternalsHTMLSource());
 }