Refactoring to make adding ink drop animations easier

ui/aura/window.cc

Index: ui/aura/window.cc
diff --git a/ui/aura/window.cc b/ui/aura/window.cc
index 6ff6c762a6cea14f20cd3ba7ceddba6f4863e2d8..61ada5ebaefbd8a8f5c0d38d66db39c835ee2e5a 100644
--- a/ui/aura/window.cc
+++ b/ui/aura/window.cc
@@ -93,7 +93,7 @@ Window::Window(WindowDelegate* delegate)
       // problems for code that adds an observer as part of an observer
       // notification (such as the workspace code).
       observers_(base::ObserverList<WindowObserver>::NOTIFY_EXISTING_ONLY) {
-  set_target_handler(delegate_);
+  ignore_result(SetTargetHandler(delegate_));
 }
 
 Window::~Window() {
@@ -109,7 +109,7 @@ Window::~Window() {
   // While we are being destroyed, our target handler may also be in the
   // process of destruction or already destroyed, so do not forward any
   // input events at the ui::EP_TARGET phase.
-  set_target_handler(nullptr);
+  ignore_result(SetTargetHandler(nullptr));
 
   // TODO(beng): See comment in window_event_dispatcher.h. This shouldn't be
   //             necessary but unfortunately is right now due to ordering