Refactor screen/monitor so that gfx::Screen returns monitor object.

chrome/browser/ui/panels/panel_browsertest.cc

Index: chrome/browser/ui/panels/panel_browsertest.cc
diff --git a/chrome/browser/ui/panels/panel_browsertest.cc b/chrome/browser/ui/panels/panel_browsertest.cc
index 9306b53ddaa6e11068d5ef4e77d6365acf275172..137eb15ccb72058215e0d82bbb70abd1623ed49f 100644
--- a/chrome/browser/ui/panels/panel_browsertest.cc
+++ b/chrome/browser/ui/panels/panel_browsertest.cc
@@ -1634,7 +1634,7 @@ class PanelAndNotificationTest : public PanelBrowserTest {
     // 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::GetPrimaryMonitorSize();
+    gfx::Size screen_size = gfx::Screen::GetPrimaryMonitor().size();
     return screen_size.height() - balloon->GetPosition().y();
 #else
     return balloon->GetPosition().y() + balloon->GetViewSize().height();