Fix a few spelling errors in comments.

ui/wm/core/shadow_controller_unittest.cc

Index: ui/wm/core/shadow_controller_unittest.cc
diff --git a/ui/wm/core/shadow_controller_unittest.cc b/ui/wm/core/shadow_controller_unittest.cc
index 7429e38f0d423874e811a0357ee0ce095503fae8..3c8ab0cc4dea5c8b5aea51d417d916f0dfb85630 100644
--- a/ui/wm/core/shadow_controller_unittest.cc
+++ b/ui/wm/core/shadow_controller_unittest.cc
@@ -155,7 +155,7 @@ TEST_F(ShadowControllerTest, ShadowStyle) {
   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());