Fix a few spelling errors in comments.

ui/wm/core/shadow_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 "ui/wm/core/shadow_controller.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 137 matching lines @@
   window2->Show();
   ActivateWindow(window2.get());
 
   // window1 is now inactive, so shadow should go inactive.
   Shadow* shadow2 = api.GetShadowForWindow(window2.get());
   ASSERT_TRUE(shadow2 != NULL);
   EXPECT_EQ(Shadow::STYLE_INACTIVE, shadow1->style());
   EXPECT_EQ(Shadow::STYLE_ACTIVE, shadow2->style());
 }
 
-// Tests that shadow gets updated when the window show state chagnes.
+// Tests that shadow gets updated when the window show state changes.
 TEST_F(ShadowControllerTest, ShowState) {
   ShadowController::TestApi api(shadow_controller());
 
   scoped_ptr<aura::Window> window(new aura::Window(NULL));
   window->SetType(ui::wm::WINDOW_TYPE_NORMAL);
   window->Init(ui::LAYER_TEXTURED);
   ParentWindow(window.get());
   window->Show();
 
   Shadow* shadow = api.GetShadowForWindow(window.get());
@@ skipping 66 matching lines @@
   AddTransientChild(window1.get(), window2.get());
   aura::client::SetHideOnDeactivate(window2.get(), true);
   window2->Show();
   ActivateWindow(window2.get());
 
   // window1 is now inactive, but its shadow should still appear active.
   EXPECT_EQ(Shadow::STYLE_ACTIVE, shadow1->style());
 }
 
 }  // namespace wm