Stack preview back at top after an active contents switch.

chrome/browser/ui/views/frame/browser_view.cc

Index: chrome/browser/ui/views/frame/browser_view.cc
diff --git a/chrome/browser/ui/views/frame/browser_view.cc b/chrome/browser/ui/views/frame/browser_view.cc
index 2002b396ca16a0a4c71bba8a4e95eb8c9b760b13..7bb5d2c5daa24e644244bac719fba32ceb8eaece 100644
--- a/chrome/browser/ui/views/frame/browser_view.cc
+++ b/chrome/browser/ui/views/frame/browser_view.cc
@@ -1653,15 +1653,7 @@ void BrowserView::ActiveTabChanged(content::WebContents* old_contents,
 
   if (change_tab_contents) {
     contents_container_->SetWebContents(new_contents);
-#if defined(USE_AURA)
-    // Put the Instant preview back on top in case it is showing custom new tab
-    // page content.
-    if (contents_->preview_web_contents()) {
-      ui::Layer* preview_layer =
-          contents_->preview_web_contents()->GetNativeView()->layer();
-      preview_layer->parent()->StackAtTop(preview_layer);
-    }
-#endif
+    contents_->MaybeStackPreviewAtTop();
   }
 
   if (!browser_->tab_strip_model()->closing_all() && GetWidget()->IsActive() &&