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

chrome/browser/ui/webui/net_export_ui.cc

Index: chrome/browser/ui/webui/net_export_ui.cc
diff --git a/chrome/browser/ui/webui/net_export_ui.cc b/chrome/browser/ui/webui/net_export_ui.cc
index 24cad05fa305376d4df489ba23d4dc6a7ccde28d..c9b3adeef2d0302fd41abbeeea6eae52ee068eb8 100644
--- a/chrome/browser/ui/webui/net_export_ui.cc
+++ b/chrome/browser/ui/webui/net_export_ui.cc
@@ -321,7 +321,7 @@ 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());
 }