Fix a leak in wm::AnimateOnChildWindowVisibilityChanged().

ui/wm/core/window_animations_unittest.cc

Index: ui/wm/core/window_animations_unittest.cc
diff --git a/ui/wm/core/window_animations_unittest.cc b/ui/wm/core/window_animations_unittest.cc
index 5968bf32440b03211c8aa95231de08b5eaabf7e3..62a3f64d8bcdd6f5ea6c6ecfd9291685e42e3b22 100644
--- a/ui/wm/core/window_animations_unittest.cc
+++ b/ui/wm/core/window_animations_unittest.cc
@@ -288,4 +288,15 @@ TEST_F(WindowAnimationsTest, NotifyHideCompleted) {
   EXPECT_TRUE(animation_host.hide_completed());
 }
 
+// The rotation animation for hidiing a window should not leak the animation
+// observer.
+TEST_F(WindowAnimationsTest, RotateHideNoLeak) {
+  scoped_ptr<aura::Window> window(aura::test::CreateTestWindowWithId(0, NULL));
+  wm::SetWindowVisibilityAnimationType(window.get(),
+                                       WINDOW_VISIBILITY_ANIMATION_TYPE_ROTATE);
+  AnimateOnChildWindowVisibilityChanged(window.get(), true);
+  EXPECT_NO_FATAL_FAILURE(
+      AnimateOnChildWindowVisibilityChanged(window.get(), false));
+}
+
 }  // namespace wm