Move shelf item tooltip flag from delegate to item.

ash/common/shelf/shelf_view.cc

Index: ash/common/shelf/shelf_view.cc
diff --git a/ash/common/shelf/shelf_view.cc b/ash/common/shelf/shelf_view.cc
index 74cc4bc1d4becf8fbfdfc9ca51045e65afdcc672..24f9b1d90c7c66da4a747faad31a9541fd1bfbd3 100644
--- a/ash/common/shelf/shelf_view.cc
+++ b/ash/common/shelf/shelf_view.cc
@@ -527,14 +527,11 @@ bool ShelfView::ShouldHideTooltip(const gfx::Point& cursor_location) const {
 }
 
 bool ShelfView::ShouldShowTooltipForView(const views::View* view) const {
-  if (view == GetAppListButton() &&
-      WmShell::Get()->GetAppListTargetVisibility()) {
+  // TODO(msw): Push this app list state into ShelfItem::shows_tooltip.
+  if (view == GetAppListButton() && GetAppListButton()->is_showing_app_list())
     return false;
-  }
   const ShelfItem* item = ShelfItemForView(view);
-  if (!item)
-    return false;
-  return model_->GetShelfItemDelegate(item->id)->ShouldShowTooltip();
+  return item && item->shows_tooltip;
 }
 
 base::string16 ShelfView::GetTitleForView(const views::View* view) const {