Rename StackingClient -> WindowTreeClient

ash/wm/stacking_controller_unittest.cc

 // Copyright (c) 2012 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/shell.h"
 #include "ash/shell_window_ids.h"
 #include "ash/test/ash_test_base.h"
 #include "ash/wm/window_properties.h"
 #include "ash/wm/window_util.h"
 #include "ui/aura/client/aura_constants.h"
@@ skipping 32 matching lines @@
       kShellWindowId_ShelfContainer);
   launcher->AddChild(w2.get());
   w2->Show();
 
   wm::ActivateWindow(w2.get());
 
   // Window with a transient parent.
   scoped_ptr<Window> w1(CreateTestWindow());
   w2->AddTransientChild(w1.get());
   w1->SetBounds(gfx::Rect(10, 11, 250, 251));
-  SetDefaultParentByPrimaryRootWindow(w1.get());
+  ParentWindowInPrimaryRootWindow(w1.get());
   w1->Show();
   wm::ActivateWindow(w1.get());
 
   // The window with the transient parent should get added to the same container
   // as its transient parent.
   EXPECT_EQ(launcher, w1->parent());
 }
 
 }  // namespace internal
 }  // namespace ash