Desktop aura: Break aura::Window::SetParent in two.

ash/wm/workspace/workspace_event_handler_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/wm/workspace/workspace_event_handler.h"
 
 #include "ash/shell.h"
 #include "ash/test/ash_test_base.h"
 #include "ash/wm/property_util.h"
 #include "ash/wm/window_util.h"
@@ skipping 13 matching lines @@
  public:
   WorkspaceEventHandlerTest() {}
   virtual ~WorkspaceEventHandlerTest() {}
 
  protected:
   aura::Window* CreateTestWindow(aura::WindowDelegate* delegate,
                                  const gfx::Rect& bounds) {
     aura::Window* window = new aura::Window(delegate);
     window->SetType(aura::client::WINDOW_TYPE_NORMAL);
     window->Init(ui::LAYER_TEXTURED);
-    window->SetParent(NULL);
+    SetDefaultParentByPrimaryRootWindow(window);
     window->SetBounds(bounds);
     window->Show();
     return window;
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(WorkspaceEventHandlerTest);
 };
 
 TEST_F(WorkspaceEventHandlerTest, DoubleClickSingleAxisResizeEdge) {
@@ skipping 123 matching lines @@
   wd.set_window_component(HTCAPTION);
 
   ASSERT_TRUE(aura::client::GetWindowMoveClient(window->parent()));
   MessageLoop::current()->DeleteSoon(FROM_HERE, window.get());
   aura::client::GetWindowMoveClient(window->parent())->RunMoveLoop(
       window.release(), gfx::Vector2d());
 }
 
 }  // namespace internal
 }  // namespace ash