[UI Views] Don't allow a ButtonListener and a MenuButtonListener

chrome/browser/ui/views/tab_icon_view.cc

Index: chrome/browser/ui/views/tab_icon_view.cc
diff --git a/chrome/browser/ui/views/tab_icon_view.cc b/chrome/browser/ui/views/tab_icon_view.cc
index 16661617ef7df038e9d665f29fd290a4d9faee7f..d249e5c9f7385f7d5d7e22e1193664eeee0bf925 100644
--- a/chrome/browser/ui/views/tab_icon_view.cc
+++ b/chrome/browser/ui/views/tab_icon_view.cc
@@ -57,7 +57,7 @@ void TabIconView::InitializeIfNeeded() {
 
 TabIconView::TabIconView(TabIconViewModel* model,
                          views::MenuButtonListener* listener)
-    : views::MenuButton(NULL, base::string16(), listener, false),
+    : views::MenuButton(base::string16(), listener, false),
       model_(model),
       is_light_(false) {
   InitializeIfNeeded();