Remove unused |context| from GetDefaultParent().

ash/mus/top_level_window_factory.cc

 // Copyright 2017 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.
 
 #include "ash/mus/top_level_window_factory.h"
 
 #include "ash/common/wm/container_finder.h"
 #include "ash/common/wm/window_state.h"
 #include "ash/common/wm_window.h"
 #include "ash/mus/disconnected_app_handler.h"
@@ skipping 171 matching lines @@
     container_window->AddChild(window);
   } else {
     WmWindow* root = root_window_controller->GetWindow();
     gfx::Point origin =
         root->ConvertPointToTarget(root->GetRootWindow(), gfx::Point());
     origin += root_window_controller->GetWindow()
                   ->GetDisplayNearestWindow()
                   .bounds()
                   .OffsetFromOrigin();
     gfx::Rect bounds_in_screen(origin, bounds.size());
-    ash::wm::GetDefaultParent(WmWindow::Get(context), WmWindow::Get(window),
-                              bounds_in_screen)
+    ash::wm::GetDefaultParent(WmWindow::Get(window), bounds_in_screen)
         ->aura_window()
         ->AddChild(window);
   }
   return window;
 }
 
 }  // namespace
 
 aura::Window* CreateAndParentTopLevelWindow(
     WindowManager* window_manager,
@@ skipping 25 matching lines @@
     if (non_client_frame_controller)
       non_client_frame_controller->set_can_activate(can_focus);
     // No need to persist this value.
     properties->erase(focusable_iter);
   }
   return window;
 }
 
 }  // namespace mus
 }  // namespace ash