Continue deleting code in ui/.

This moves ui/base/hit_test.h into its one consumer,
services/window_manager/, and moves the only part of cursor.h that is
still used into platform_window.h.

BUG=443439
R=sky@chromium.org

Review URL: https://codereview.chromium.org/860873002
diff --git a/services/window_manager/window_manager_app.cc b/services/window_manager/window_manager_app.cc
index 56dbbc4..da49468 100644
--- a/services/window_manager/window_manager_app.cc
+++ b/services/window_manager/window_manager_app.cc
@@ -16,11 +16,11 @@
 #include "services/window_manager/capture_controller.h"
 #include "services/window_manager/focus_controller.h"
 #include "services/window_manager/focus_rules.h"
+#include "services/window_manager/hit_test.h"
 #include "services/window_manager/view_event_dispatcher.h"
 #include "services/window_manager/view_target.h"
 #include "services/window_manager/view_targeter.h"
 #include "services/window_manager/window_manager_delegate.h"
-#include "ui/base/hit_test.h"
 #include "ui/events/gestures/gesture_recognizer.h"
 
 using mojo::ApplicationConnection;