mash: Support ShelfWindowWatcher via ShelfItem properties.

ash/mus/bridge/wm_window_mus.h

Index: ash/mus/bridge/wm_window_mus.h
diff --git a/ash/mus/bridge/wm_window_mus.h b/ash/mus/bridge/wm_window_mus.h
index 513089b926a87f8908a422bf641f1941b2171f13..6fe223e8b572f7c9dfaf17115bbd1c8d3b255f4c 100644
--- a/ash/mus/bridge/wm_window_mus.h
+++ b/ash/mus/bridge/wm_window_mus.h
@@ -116,6 +116,7 @@ class WmWindowMus : public WmWindow, public ui::WindowObserver {
   WmShell* GetShell() const override;
   void SetName(const char* name) override;
   std::string GetName() const override;
+  void SetTitle(const base::string16& title) override;
   base::string16 GetTitle() const override;
   void SetShellWindowId(int id) override;
   int GetShellWindowId() const override;
@@ -147,9 +148,6 @@ class WmWindowMus : public WmWindow, public ui::WindowObserver {
   void SetColorProperty(WmWindowProperty key, SkColor value) override;
   int GetIntProperty(WmWindowProperty key) override;
   void SetIntProperty(WmWindowProperty key, int value) override;
-  ShelfItemDetails* GetShelfItemDetails() override;
-  void SetShelfItemDetails(const ShelfItemDetails& details) override;
-  void ClearShelfItemDetails() override;
   const wm::WindowState* GetWindowState() const override;
   WmWindow* GetToplevelWindow() override;
   WmWindow* GetToplevelWindowForFocus() override;