Move shelf item tooltip flag from delegate to item.

ash/common/wm/window_state.h

Index: ash/common/wm/window_state.h
diff --git a/ash/common/wm/window_state.h b/ash/common/wm/window_state.h
index a01d923ecf963837d69281cc94bb2067fec759e5..37df31338ee3f8b5c440b203d991106aecfb5529 100644
--- a/ash/common/wm/window_state.h
+++ b/ash/common/wm/window_state.h
@@ -248,12 +248,6 @@ class ASH_EXPORT WindowState {
   bool bounds_changed_by_user() const { return bounds_changed_by_user_; }
   void set_bounds_changed_by_user(bool bounds_changed_by_user);
 
-  // True if this window is an attached panel.
-  bool panel_attached() const { return panel_attached_; }
-  void set_panel_attached(bool panel_attached) {
-    panel_attached_ = panel_attached;
-  }
-
   // True if the window is ignored by the shelf layout manager for
   // purposes of darkening the shelf.
   bool ignored_by_shelf() const { return ignored_by_shelf_; }
@@ -372,7 +366,6 @@ class ASH_EXPORT WindowState {
 
   bool window_position_managed_;
   bool bounds_changed_by_user_;
-  bool panel_attached_;
   bool ignored_by_shelf_;
   bool can_consume_system_keys_;
   std::unique_ptr<DragDetails> drag_details_;