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

chrome/browser/notifications/balloon_collection_impl.cc

Index: chrome/browser/notifications/balloon_collection_impl.cc
diff --git a/chrome/browser/notifications/balloon_collection_impl.cc b/chrome/browser/notifications/balloon_collection_impl.cc
index 1f4435ae74bae3bbcd9d590984d020a731918943..a6f378a95c936053db5ff72303e5162efd56ebf8 100644
--- a/chrome/browser/notifications/balloon_collection_impl.cc
+++ b/chrome/browser/notifications/balloon_collection_impl.cc
@@ -464,7 +464,9 @@ bool BalloonCollectionImpl::Layout::RefreshSystemMetrics() {
 #if defined(OS_MACOSX)
   gfx::Rect new_work_area = GetMacWorkArea();
 #else
-  gfx::Rect new_work_area = gfx::Screen::GetPrimaryDisplay().work_area();
+  // TODO(scottmg): NativeScreen is wrong. http://crbug.com/133312
+  gfx::Rect new_work_area =
+      gfx::Screen::GetNativeScreen()->GetPrimaryDisplay().work_area();
 #endif
   if (work_area_ != new_work_area) {
     work_area_.SetRect(new_work_area.x(), new_work_area.y(),