Rename Launcher to Shelf.

ash/system/web_notification/web_notification_tray.cc

Index: ash/system/web_notification/web_notification_tray.cc
diff --git a/ash/system/web_notification/web_notification_tray.cc b/ash/system/web_notification/web_notification_tray.cc
index b0b75d87dfca2f01d69f3610cd4ed6a685bcfe1b..639bb9107a963badda9eb8825901ab7cbf614f23 100644
--- a/ash/system/web_notification/web_notification_tray.cc
+++ b/ash/system/web_notification/web_notification_tray.cc
@@ -195,7 +195,7 @@ void WorkAreaObserver::UpdateShelf() {
   if (shelf_)
     return;
 
-  shelf_ = ShelfLayoutManager::ForLauncher(root_window_);
+  shelf_ = ShelfLayoutManager::ForShelf(root_window_);
   if (shelf_)
     shelf_->AddObserver(this);
 }
@@ -431,7 +431,7 @@ bool WebNotificationTray::ShouldShowMessageCenter() {
         status_area_widget()->system_tray()->HasNotificationBubble());
 }
 
-bool WebNotificationTray::ShouldBlockLauncherAutoHide() const {
+bool WebNotificationTray::ShouldBlockShelfAutoHide() const {
   return should_block_shelf_auto_hide_;
 }