Remove aura::RootWindow instance from LayerAnimator::observers_ when the window is deleted

ui/aura_shell/shell_accelerator_controller_unittest.cc

 // Copyright (c) 2011 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_shell/shell.h"
 #include "ui/aura_shell/shell_accelerator_controller.h"
 #include "ui/aura_shell/test/aura_shell_test_base.h"
 
 namespace aura_shell {
 namespace test {
@@ skipping 136 matching lines @@
   //     ui::Accelerator(ui::VKEY_TAB, true, false, true)));
   // CycleForwrard
   // EXPECT_TRUE(GetController()->Process(
   //     ui::Accelerator(ui::VKEY_TAB, false, false, true)));
   // TakeScreenshot
   // EXPECT_TRUE(GetController()->Process(
   //     ui::Accelerator(ui::VKEY_F5, false, true, false)));
   // EXPECT_TRUE(GetController()->Process(
   //     ui::Accelerator(ui::VKEY_PRINT, false, false, false)));
 #if !defined(NDEBUG)
-  // TODO(mazda): Callig RotateScreen in unit test causes a crash because of
-  // "pure virtual method called" for some reasons. Need to investigate.
   // RotateScreen
-  // EXPECT_TRUE(GetController()->Process(
-  //     ui::Accelerator(ui::VKEY_HOME, false, true, false)));
+  EXPECT_TRUE(GetController()->Process(
+      ui::Accelerator(ui::VKEY_HOME, false, true, false)));
 #if !defined(OS_LINUX)
   // ToggleDesktopFullScreen (not implemented yet on Linux)
   EXPECT_TRUE(GetController()->Process(
       ui::Accelerator(ui::VKEY_F11, false, true, false)));
 #endif
 #endif
 }
 
 }  // namespace test
 }  // namespace aura_shell