Change SetImage, SetBackground, and SetToggledImage to take in a gfx::ImageSkia

ash/system/tray/tray_image_item.cc

Index: ash/system/tray/tray_image_item.cc
diff --git a/ash/system/tray/tray_image_item.cc b/ash/system/tray/tray_image_item.cc
index a92f2ad3baca34dccc6099a7ee1764bf122604aa..449cbd72c7a8d46d3171745b2c1b91be05fc6f59 100644
--- a/ash/system/tray/tray_image_item.cc
+++ b/ash/system/tray/tray_image_item.cc
@@ -29,7 +29,7 @@ views::View* TrayImageItem::CreateTrayView(user::LoginStatus status) {
   tray_view_ = new TrayItemView;
   tray_view_->CreateImageView();
   tray_view_->image_view()->SetImage(ui::ResourceBundle::GetSharedInstance().
-      GetImageNamed(resource_id_).ToSkBitmap());
+      GetImageNamed(resource_id_).ToImageSkia());
   tray_view_->SetVisible(GetInitialVisibility());
   return tray_view_;
 }