ash: Rename LauncherModel to ShelfModel.

ash/launcher/launcher_item_delegate_manager.cc

Index: ash/launcher/launcher_item_delegate_manager.cc
diff --git a/ash/launcher/launcher_item_delegate_manager.cc b/ash/launcher/launcher_item_delegate_manager.cc
index ecc821cdbc5eeabdb73e688b36ae8c14dcc16070..efd885717f646b9c754420939573392acd532698 100644
--- a/ash/launcher/launcher_item_delegate_manager.cc
+++ b/ash/launcher/launcher_item_delegate_manager.cc
@@ -5,15 +5,15 @@
 #include "ash/launcher/launcher_item_delegate_manager.h"
 
 #include "ash/launcher/launcher_item_delegate.h"
-#include "ash/launcher/launcher_model.h"
+#include "ash/shelf/shelf_model.h"
 #include "ash/shell.h"
 #include "base/logging.h"
 #include "base/stl_util.h"
 
 namespace ash {
 
-LauncherItemDelegateManager::LauncherItemDelegateManager(
-    ash::LauncherModel* model) : model_(model) {
+LauncherItemDelegateManager::LauncherItemDelegateManager(ShelfModel* model)
+    : model_(model) {
   DCHECK(model_);
   model_->AddObserver(this);
 }