Add a flag use_software_compositing to the Widget::InitParams structure.

chrome/browser/ui/views/omnibox/omnibox_popup_contents_view.cc

Index: chrome/browser/ui/views/omnibox/omnibox_popup_contents_view.cc
diff --git a/chrome/browser/ui/views/omnibox/omnibox_popup_contents_view.cc b/chrome/browser/ui/views/omnibox/omnibox_popup_contents_view.cc
index 8f708ab0b358d52370f6708851a4204de4cef196..dd3b74ad29b0e17353346865b466276ca8aacd06 100644
--- a/chrome/browser/ui/views/omnibox/omnibox_popup_contents_view.cc
+++ b/chrome/browser/ui/views/omnibox/omnibox_popup_contents_view.cc
@@ -234,17 +234,13 @@ void OmniboxPopupContentsView::UpdatePopupAppearance() {
 
     // If the popup is currently closed, we need to create it.
     popup_ = (new AutocompletePopupWidget)->AsWeakPtr();
-    // On Windows use TYPE_MENU to ensure that this window uses the software
-    // compositor which avoids the UI thread blocking issue during command
-    // buffer creation. We can revert this change once http://crbug.com/125248
-    // is fixed.
-#if defined(OS_WIN)
-    views::Widget::InitParams params(views::Widget::InitParams::TYPE_MENU);
-    // The menu style assumes a top most window. We don't want that in this
-    // case.
-    params.keep_on_top = false;
-#else
+
     views::Widget::InitParams params(views::Widget::InitParams::TYPE_POPUP);
+#if defined(OS_WIN)
+    // On Windows use the software compositor to ensure that we don't block
+    // the UI thread blocking issue during command buffer creation. We can
+    // revert this change once http://crbug.com/125248 is fixed.
+    params.force_software_compositing = true;
 #endif
     params.opacity = views::Widget::InitParams::TRANSLUCENT_WINDOW;
     params.parent = popup_parent->GetNativeView();