mus: Allow SetModal to fail gracefully

components/mus/public/cpp/lib/window_private.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_MUS_PUBLIC_CPP_LIB_WINDOW_PRIVATE_H_
 #define COMPONENTS_MUS_PUBLIC_CPP_LIB_WINDOW_PRIVATE_H_
 
 #include <stdint.h>
 
 #include <vector>
@@ skipping 44 matching lines @@
 
   void LocalDestroy() { window_->LocalDestroy(); }
   void LocalAddChild(Window* child) { window_->LocalAddChild(child); }
   void LocalRemoveChild(Window* child) { window_->LocalRemoveChild(child); }
   void LocalAddTransientWindow(Window* child) {
     window_->LocalAddTransientWindow(child);
   }
   void LocalRemoveTransientWindow(Window* child) {
     window_->LocalRemoveTransientWindow(child);
   }
+  void LocalUnsetModal() { window_->is_modal_ = false; }
   void LocalReorder(Window* relative, mojom::OrderDirection direction) {
     window_->LocalReorder(relative, direction);
   }
   void LocalSetBounds(const gfx::Rect& old_bounds,
                       const gfx::Rect& new_bounds) {
     window_->LocalSetBounds(old_bounds, new_bounds);
   }
   void LocalSetClientArea(
       const gfx::Insets& client_area,
       const std::vector<gfx::Rect>& additional_client_areas) {
@@ skipping 14 matching lines @@
 
  private:
   Window* window_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowPrivate);
 };
 
 }  // namespace mus
 
 #endif  // COMPONENTS_MUS_PUBLIC_CPP_LIB_WINDOW_PRIVATE_H_