diff --git a/atom/browser/api/atom_api_web_request.cc b/atom/browser/api/atom_api_web_request.cc
index 07c0576977dc..a1b4df70c130 100644
--- a/atom/browser/api/atom_api_web_request.cc
+++ b/atom/browser/api/atom_api_web_request.cc
@@ -28,13 +28,14 @@ WebRequest::~WebRequest() {
 
 template<AtomNetworkDelegate::EventTypes type>
 void WebRequest::SetListener(mate::Arguments* args) {
-  DCHECK_CURRENTLY_ON(BrowserThread::UI);
-
-  scoped_ptr<base::DictionaryValue> filter(new base::DictionaryValue());
+  scoped_ptr<base::DictionaryValue> filter(new base::DictionaryValue);
   args->GetNext(filter.get());
+
+  v8::Local<v8::Value> value;
   AtomNetworkDelegate::Listener callback;
-  if (!args->GetNext(&callback)) {
-    args->ThrowError("Must pass null or a function");
+  if (!args->GetNext(&callback) &&
+      !(args->GetNext(&value) && value->IsNull())) {
+    args->ThrowError("Must pass null or a Function");
     return;
   }
 
diff --git a/atom/browser/api/atom_api_web_request.h b/atom/browser/api/atom_api_web_request.h
index 597bb80f7c65..f156b5816195 100644
--- a/atom/browser/api/atom_api_web_request.h
+++ b/atom/browser/api/atom_api_web_request.h
@@ -5,8 +5,6 @@
 #ifndef ATOM_BROWSER_API_ATOM_API_WEB_REQUEST_H_
 #define ATOM_BROWSER_API_ATOM_API_WEB_REQUEST_H_
 
-#include <string>
-
 #include "atom/browser/api/trackable_object.h"
 #include "atom/browser/net/atom_network_delegate.h"
 #include "native_mate/arguments.h"
diff --git a/atom/browser/net/atom_network_delegate.h b/atom/browser/net/atom_network_delegate.h
index 9f78cc8d92da..adc6935f2086 100644
--- a/atom/browser/net/atom_network_delegate.h
+++ b/atom/browser/net/atom_network_delegate.h
@@ -7,7 +7,6 @@
 
 #include <map>
 #include <set>
-#include <string>
 
 #include "brightray/browser/network_delegate.h"
 #include "base/callback.h"