ash: Remove use of ALLOW_THIS_IN_INITIALIZER_LIST.

ash/system/tray/tray_background_view.cc

Index: ash/system/tray/tray_background_view.cc
diff --git a/ash/system/tray/tray_background_view.cc b/ash/system/tray/tray_background_view.cc
index 857ab38903d092adc9ad885a624e70cb8c6cca6f..6a67a9edfc4bf6c23f0b702ce350134649cf3874 100644
--- a/ash/system/tray/tray_background_view.cc
+++ b/ash/system/tray/tray_background_view.cc
@@ -166,12 +166,10 @@ TrayBackgroundView::TrayBackgroundView(
       tray_container_(NULL),
       shelf_alignment_(SHELF_ALIGNMENT_BOTTOM),
       background_(NULL),
-      ALLOW_THIS_IN_INITIALIZER_LIST(hide_background_animator_(
-          this, 0, kTrayBackgroundAlpha)),
-      ALLOW_THIS_IN_INITIALIZER_LIST(hover_background_animator_(
-          this, 0, kTrayBackgroundHoverAlpha - kTrayBackgroundAlpha)),
-      ALLOW_THIS_IN_INITIALIZER_LIST(widget_observer_(
-          new TrayWidgetObserver(this))) {
+      hide_background_animator_(this, 0, kTrayBackgroundAlpha),
+      hover_background_animator_(
+          this, 0, kTrayBackgroundHoverAlpha - kTrayBackgroundAlpha),
+      widget_observer_(new TrayWidgetObserver(this)) {
   set_notify_enter_exit_on_child(true);
 
   // Initially we want to paint the background, but without the hover effect.