Add context to gfx::Screen calls in support of simultaneous desktop+ash

chrome/browser/ui/panels/panel_and_desktop_notification_browsertest.cc

Index: chrome/browser/ui/panels/panel_and_desktop_notification_browsertest.cc
diff --git a/chrome/browser/ui/panels/panel_and_desktop_notification_browsertest.cc b/chrome/browser/ui/panels/panel_and_desktop_notification_browsertest.cc
index 3cf1377ba1180f744011cd78b73f4c298b25e546..7db8886d5c2396e6cf78da3c409a97b46b42f49d 100644
--- a/chrome/browser/ui/panels/panel_and_desktop_notification_browsertest.cc
+++ b/chrome/browser/ui/panels/panel_and_desktop_notification_browsertest.cc
@@ -83,7 +83,8 @@ class PanelAndDesktopNotificationTest : public BasePanelBrowserTest {
     // The position returned by the notification balloon is based on Mac's
     // vertically inverted orientation. We need to flip it so that it can
     // be compared against the position returned by the panel.
-    gfx::Size screen_size = gfx::Screen::GetPrimaryDisplay().size();
+    gfx::Size screen_size =
+        gfx::Screen::GetNativeScreen()->GetPrimaryDisplay().size();
     return screen_size.height() - balloon->GetPosition().y();
 #else
     return balloon->GetPosition().y() + balloon->GetViewSize().height();