VR: Factor transient timing out of UiSceneManager.

chrome/browser/android/vr_shell/ui_elements/exclusive_screen_toast.cc

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/android/vr_shell/ui_elements/exclusive_screen_toast.h"
 
 #include "chrome/browser/android/vr_shell/textures/ui_texture.h"
 #include "chrome/browser/android/vr_shell/ui_elements/textured_element.h"
 
 namespace vr_shell {
 
-ExclusiveScreenToast::ExclusiveScreenToast(int preferred_width)
-    : SimpleTexturedElement(preferred_width) {}
+ExclusiveScreenToast::ExclusiveScreenToast(int preferred_width,
+                                           const base::TimeDelta& timeout)
+    : TransientSimpleTexturedElement(preferred_width, timeout) {}
 
 ExclusiveScreenToast::~ExclusiveScreenToast() = default;
 
 void ExclusiveScreenToast::UpdateElementSize() {
   // Adjust the width of this element according to the texture. The width is
   // decided by the length of the text to show.
   gfx::SizeF drawn_size = GetTexture()->GetDrawnSize();
   float width = drawn_size.width() / drawn_size.height() * size().y();
   set_size({width, size().y(), 1});
 }
 
 }  // namespace vr_shell