Revert of mus: Enable system modal windows

components/mus/ws/window_manager_state.cc

Index: components/mus/ws/window_manager_state.cc
diff --git a/components/mus/ws/window_manager_state.cc b/components/mus/ws/window_manager_state.cc
index 71e69c4d4434ef16c794bd7931f443be8da3b0b6..681a52345687cd9536817f4c5dbb4ef4d18303b6 100644
--- a/components/mus/ws/window_manager_state.cc
+++ b/components/mus/ws/window_manager_state.cc
@@ -127,16 +127,23 @@
 
 void WindowManagerState::ReleaseCaptureBlockedByModalWindow(
     const ServerWindow* modal_window) {
-  event_dispatcher_.ReleaseCaptureBlockedByModalWindow(modal_window);
+  if (!capture_window() || !modal_window->is_modal() ||
+      !modal_window->IsDrawn())
+    return;
+
+  if (modal_window->transient_parent() &&
+      !modal_window->transient_parent()->Contains(capture_window())) {
+    return;
+  }
+
+  SetCapture(nullptr, false);
 }
 
 void WindowManagerState::ReleaseCaptureBlockedByAnyModalWindow() {
-  event_dispatcher_.ReleaseCaptureBlockedByAnyModalWindow();
-}
-
-void WindowManagerState::AddSystemModalWindow(ServerWindow* window) {
-  DCHECK(!window->transient_parent());
-  event_dispatcher_.AddSystemModalWindow(window);
+  if (!capture_window() || !capture_window()->IsBlockedByModalWindow())
+    return;
+
+  SetCapture(nullptr, false);
 }
 
 mojom::DisplayPtr WindowManagerState::ToMojomDisplay() const {