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

chrome/browser/ui/views/content_setting_bubble_contents.cc

Index: chrome/browser/ui/views/content_setting_bubble_contents.cc
diff --git a/chrome/browser/ui/views/content_setting_bubble_contents.cc b/chrome/browser/ui/views/content_setting_bubble_contents.cc
index ec5883af1aa92d0cfed1cdff9fcfa0270564cff5..40544c4976b41855897af44761e02e94a9c8042a 100644
--- a/chrome/browser/ui/views/content_setting_bubble_contents.cc
+++ b/chrome/browser/ui/views/content_setting_bubble_contents.cc
@@ -304,8 +304,7 @@ void ContentSettingBubbleContents::Init() {
       label->SetHorizontalAlignment(gfx::ALIGN_LEFT);
 
       views::MenuButton* menu_button = new views::MenuButton(
-          NULL, base::UTF8ToUTF16((i->second.selected_device.name)),
-          this, true);
+          base::UTF8ToUTF16((i->second.selected_device.name)), this, true);
       menu_button->SetStyle(views::Button::STYLE_BUTTON);
       menu_button->SetHorizontalAlignment(gfx::ALIGN_LEFT);
       menu_button->set_animate_on_state_change(false);