Remove non USE_AURA code from views files.

ui/message_center/views/toast_contents_view.cc

Index: ui/message_center/views/toast_contents_view.cc
diff --git a/ui/message_center/views/toast_contents_view.cc b/ui/message_center/views/toast_contents_view.cc
index 1751451fde7995165c8ff46f883fb449467efdd3..690e694156827f658ab2c4a5ae7a4b3be0b4574e 100644
--- a/ui/message_center/views/toast_contents_view.cc
+++ b/ui/message_center/views/toast_contents_view.cc
@@ -172,16 +172,16 @@ void ToastContentsView::OnBoundsAnimationEndedOrCancelled(
     const gfx::Animation* animation) {
   if (is_closing_ && closing_animation_ == animation && GetWidget()) {
     views::Widget* widget = GetWidget();
-#if defined(USE_AURA)
+
     // TODO(dewittj): This is a workaround to prevent a nasty bug where
     // closing a transparent widget doesn't actually remove the window,
     // causing entire areas of the screen to become unresponsive to clicks.
     // See crbug.com/243469
     widget->Hide();
-# if defined(OS_WIN)
+#if defined(OS_WIN)
     widget->SetOpacity(0xFF);
-# endif
 #endif
+
     widget->Close();
   }