Fix net-export file path that is used on desktop.

chrome/browser/ui/webui/net_export_ui.cc

 // Copyright (c) 2013 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_export_ui.h"
 
 #include <memory>
 #include <string>
 #include <vector>
 
@@ skipping 303 matching lines @@
       base::UTF8ToUTF16(email), base::UTF8ToUTF16(subject),
       base::UTF8ToUTF16(body), base::UTF8ToUTF16(title),
       base::UTF8ToUTF16(file_to_attach));
 #endif
 }
 
 void NetExportMessageHandler::StartNetLog(const base::FilePath& path) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
   file_writer_->StartNetLog(
-      base::FilePath(), capture_mode_,
+      path, capture_mode_,
       base::CommandLine::ForCurrentProcess()->GetCommandLineString(),
       chrome::GetChannelString(), GetURLRequestContexts());
 }
 
 void NetExportMessageHandler::ShowFileInShell(const base::FilePath& path) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   if (path.empty())
     return;
 
   // (The |profile| parameter is relevant for Chrome OS)
@@ skipping 58 matching lines @@
 
 }  // namespace
 
 NetExportUI::NetExportUI(content::WebUI* web_ui) : WebUIController(web_ui) {
   web_ui->AddMessageHandler(base::MakeUnique<NetExportMessageHandler>());
 
   // Set up the chrome://net-export/ source.
   Profile* profile = Profile::FromWebUI(web_ui);
   content::WebUIDataSource::Add(profile, CreateNetExportHTMLSource());
 }