mash: Convert AshPopupAlignmentDelegate to wm common types

ash/mus/bridge/wm_shelf_mus.cc

Index: ash/mus/bridge/wm_shelf_mus.cc
diff --git a/ash/mus/bridge/wm_shelf_mus.cc b/ash/mus/bridge/wm_shelf_mus.cc
index b8d8b71aec2266f683d5b484e098a9d716ba8cf9..ffee9680c1a2c49f694bdac55ef5088426f3c23c 100644
--- a/ash/mus/bridge/wm_shelf_mus.cc
+++ b/ash/mus/bridge/wm_shelf_mus.cc
@@ -50,6 +50,11 @@ void WmShelfMus::SetAutoHideBehavior(ShelfAutoHideBehavior behavior) {
   NOTIMPLEMENTED();
 }
 
+ShelfAutoHideState WmShelfMus::GetAutoHideState() const {
+  NOTIMPLEMENTED();
+  return SHELF_AUTO_HIDE_HIDDEN;
+}
+
 ShelfBackgroundType WmShelfMus::GetBackgroundType() const {
   NOTIMPLEMENTED();
   return SHELF_BACKGROUND_DEFAULT;
@@ -64,6 +69,11 @@ ShelfVisibilityState WmShelfMus::GetVisibilityState() const {
   return shelf_layout_manager_->GetShelfWindow() ? SHELF_VISIBLE : SHELF_HIDDEN;
 }
 
+gfx::Rect WmShelfMus::GetUserWorkAreaBounds() const {
+  NOTIMPLEMENTED();
+  return gfx::Rect();
+}
+
 void WmShelfMus::UpdateIconPositionForWindow(WmWindow* window) {
   NOTIMPLEMENTED();
 }