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 f5e7317df9da5290a38c11638ea5fb3ba0f17f4e..e93e4332d5c0e86dc10ebb0b9181414652ae214f 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 might be wrong. http://crbug.com/133312
+  gfx::Rect new_work_area =
+      gfx::Screen::GetNativeScreen()->GetPrimaryDisplay().work_area();
 #endif
   if (!work_area_.Equals(new_work_area)) {
     work_area_.SetRect(new_work_area.x(), new_work_area.y(),