mash: Migrate SessionStateDelegate interface to wm common types

ash/test/test_session_state_delegate.cc

Index: ash/test/test_session_state_delegate.cc
diff --git a/ash/test/test_session_state_delegate.cc b/ash/test/test_session_state_delegate.cc
index afab25d852967a1b56d9d523c1dc9a69006ab8d8..40c438b0cc64d9e0d2f117ce4028d4cd8922f3c0 100644
--- a/ash/test/test_session_state_delegate.cc
+++ b/ash/test/test_session_state_delegate.cc
@@ -212,12 +212,12 @@ const user_manager::UserInfo* TestSessionStateDelegate::GetUserInfo(
   return user_list_[index < max ? index : max - 1];
 }
 
-bool TestSessionStateDelegate::ShouldShowAvatar(aura::Window* window) const {
+bool TestSessionStateDelegate::ShouldShowAvatar(WmWindow* window) const {
   return !GetActiveUserInfo()->GetImage().isNull();
 }
 
 gfx::ImageSkia TestSessionStateDelegate::GetAvatarImageForWindow(
-    aura::Window* window) const {
+    WmWindow* window) const {
   return gfx::ImageSkia();
 }