Remove unused include

atom/browser/web_dialog_helper.cc

@@ -16,7 +16,6 @@
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/common/pref_names.h"
 #include "components/prefs/pref_service.h"
-#include "content/public/browser/browser_thread.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/render_view_host.h"