chromeos: Remove TrayBubbleView::Delegate::OnBeforeBubbleWidgetInit

ash/system/tray/system_tray.cc

Index: ash/system/tray/system_tray.cc
diff --git a/ash/system/tray/system_tray.cc b/ash/system/tray/system_tray.cc
index 9e8fc5d9c02ccd09708d9a550d59fca28eb350f2..418130af192e6619f462c2f848ca9874ddfaf1d8 100644
--- a/ash/system/tray/system_tray.cc
+++ b/ash/system/tray/system_tray.cc
@@ -581,16 +581,6 @@ base::string16 SystemTray::GetAccessibleNameForBubble() {
   return GetAccessibleNameForTray();
 }
 
-void SystemTray::OnBeforeBubbleWidgetInit(
-    views::Widget* anchor_widget,
-    views::Widget* bubble_widget,
-    views::Widget::InitParams* params) const {
-  // Place the bubble in the same root window as |anchor_widget|.
-  RootWindowController::ForWindow(anchor_widget->GetNativeWindow())
-      ->ConfigureWidgetInitParamsForContainer(
-          bubble_widget, kShellWindowId_SettingBubbleContainer, params);
-}
-
 void SystemTray::HideBubble(const TrayBubbleView* bubble_view) {
   HideBubbleWithView(bubble_view);
 }