Fix the full screen switching browser window dipping below launcher bar issue.

ash/wm/workspace/workspace_window_resizer_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_window_resizer.h"
 
 #include "ash/shell.h"
 #include "ash/test/ash_test_base.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/screen_aura.h"
@@ skipping 33 matching lines @@
   WorkspaceWindowResizerTest() : window_(NULL) {}
   virtual ~WorkspaceWindowResizerTest() {}
 
   virtual void SetUp() OVERRIDE {
     WorkspaceWindowResizer::SetScaleWindowsForTest(false);
     AshTestBase::SetUp();
     aura::RootWindow* root = Shell::GetInstance()->GetRootWindow();
     root->SetBounds(gfx::Rect(0, 0, 800, kRootHeight));
     gfx::Rect root_bounds(root->bounds());
     EXPECT_EQ(kRootHeight, root_bounds.height());
-    root->screen()->set_work_area_insets(gfx::Insets());
+    root->SetScreenWorkAreaInsets(gfx::Insets());
     window_.reset(new aura::Window(&delegate_));
     window_->Init(ui::Layer::LAYER_NOT_DRAWN);
     window_->SetParent(Shell::GetInstance()->GetRootWindow());
   }
 
   virtual void TearDown() OVERRIDE {
     WorkspaceWindowResizer::SetScaleWindowsForTest(true);
     window_.reset();
     AshTestBase::TearDown();
   }
@@ skipping 202 matching lines @@
 
     resizer.Drag(CalculateDragPoint(resizer, -100));
     EXPECT_EQ(200, window_->bounds().y());
     EXPECT_EQ(300, window_->bounds().height());
   }
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace aura