mash: Migrate SessionStateDelegate interface to wm common types

ash/sysui/shell_delegate_mus.cc

Index: ash/sysui/shell_delegate_mus.cc
diff --git a/ash/sysui/shell_delegate_mus.cc b/ash/sysui/shell_delegate_mus.cc
index 26397a6456d24ed39ffb91518e4d093a27f5f90b..41bf3f29214074f077eed2424770b723a9e7e958 100644
--- a/ash/sysui/shell_delegate_mus.cc
+++ b/ash/sysui/shell_delegate_mus.cc
@@ -56,10 +56,12 @@ class SessionStateDelegateStub : public SessionStateDelegate {
   const user_manager::UserInfo* GetUserInfo(UserIndex index) const override {
     return user_info_.get();
   }
-  bool ShouldShowAvatar(aura::Window* window) const override {
+  bool ShouldShowAvatar(WmWindow* window) const override {
+    NOTIMPLEMENTED();
     return !user_info_->GetImage().isNull();
   }
-  gfx::ImageSkia GetAvatarImageForWindow(aura::Window* window) const override {
+  gfx::ImageSkia GetAvatarImageForWindow(WmWindow* window) const override {
+    NOTIMPLEMENTED();
     return gfx::ImageSkia();
   }
   void SwitchActiveUser(const AccountId& account_id) override {}