Moves move logic into WM instead of WS

components/mus/ws/server_window.h

Index: components/mus/ws/server_window.h
diff --git a/components/mus/ws/server_window.h b/components/mus/ws/server_window.h
index afcdbdf135ec48acbd2b51be8df5033ae5eaf863..0f1eb24c1a429be266a94b4bb04171a154135f73 100644
--- a/components/mus/ws/server_window.h
+++ b/components/mus/ws/server_window.h
@@ -101,13 +101,6 @@ class ServerWindow {
   }
   void SetProperty(const std::string& name, const std::vector<uint8_t>* value);
 
-  bool is_draggable_window_container() const {
-    return is_draggable_window_container_;
-  }
-  void set_is_draggable_window_container(bool value) {
-    is_draggable_window_container_ = value;
-  }
-
   void SetTextInputState(const ui::TextInputState& state);
   const ui::TextInputState& text_input_state() const {
     return text_input_state_;
@@ -147,8 +140,6 @@ class ServerWindow {
   gfx::Transform transform_;
   ui::TextInputState text_input_state_;
 
-  bool is_draggable_window_container_;
-
   std::map<std::string, std::vector<uint8_t>> properties_;
 
   base::ObserverList<ServerWindowObserver> observers_;