Remove unused |context| from GetDefaultParent().

ui/aura/client/window_parenting_client.cc

 // Copyright (c) 2013 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 "ui/aura/client/window_parenting_client.h"
 
 #include "ui/aura/env.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_event_dispatcher.h"
 #include "ui/base/class_property.h"
@@ skipping 28 matching lines @@
 }
 
 void ParentWindowWithContext(Window* window,
                              Window* context,
                              const gfx::Rect& screen_bounds) {
   DCHECK(context);
 
   // |context| must be attached to a hierarchy with a WindowParentingClient.
   WindowParentingClient* client = GetWindowParentingClient(context);
   DCHECK(client);
-  Window* default_parent =
-      client->GetDefaultParent(context, window, screen_bounds);
+  Window* default_parent = client->GetDefaultParent(window, screen_bounds);
   default_parent->AddChild(window);
 }
 
 }  // namespace client
 }  // namespace aura