ash uber tray: Make it work in ash_shell, and a couple more fixes.

ash/shell_factory.h

Index: ash/shell_factory.h
diff --git a/ash/shell_factory.h b/ash/shell_factory.h
index 4b88f3e548dabc20035cff5afa834f4f1b1fd5e5..6b6e380901420faac3b25000eea32f7eea7c0736 100644
--- a/ash/shell_factory.h
+++ b/ash/shell_factory.h
@@ -9,6 +9,7 @@
 #include "ash/ash_export.h"
 
 namespace views {
+class View;
 class Widget;
 }
 
@@ -18,7 +19,7 @@ namespace ash {
 
 namespace internal {
 views::Widget* CreateDesktopBackground();
-ASH_EXPORT views::Widget* CreateStatusArea();
+ASH_EXPORT views::Widget* CreateStatusArea(views::View* contents);
 }  // namespace internal
 
 }  // namespace ash