mash: Create and show a shelf in mash.

ash/shelf/shelf.cc

Index: ash/shelf/shelf.cc
diff --git a/ash/shelf/shelf.cc b/ash/shelf/shelf.cc
index f0619a70c66a7d4c019b1695f944c96b781cfcda..1b4e2c879a5cef5de5a94ef51c92fd834ddd3c63 100644
--- a/ash/shelf/shelf.cc
+++ b/ash/shelf/shelf.cc
@@ -136,14 +136,6 @@ void Shelf::CycleWindowLinear(CycleDirection direction) {
     ActivateShelfItem(item_index);
 }
 
-void Shelf::AddIconObserver(ShelfIconObserver* observer) {
-  shelf_view_->AddIconObserver(observer);
-}
-
-void Shelf::RemoveIconObserver(ShelfIconObserver* observer) {
-  shelf_view_->RemoveIconObserver(observer);
-}
-
 bool Shelf::IsShowingMenu() const {
   return shelf_view_->IsShowingMenu();
 }