Revert of cancel overlay-scrollbar hover state when moving pointer out of window for ChromeOS

ui/events/blink/web_input_event.cc

Index: ui/events/blink/web_input_event.cc
diff --git a/ui/events/blink/web_input_event.cc b/ui/events/blink/web_input_event.cc
index 674f64f24e4a0eafe525f43565331fca9c1e733f..705818f15fa968173113e6cfdb55a2c9b97233de 100644
--- a/ui/events/blink/web_input_event.cc
+++ b/ui/events/blink/web_input_event.cc
@@ -399,14 +399,8 @@
       webkit_event.type = blink::WebInputEvent::MouseUp;
       webkit_event.clickCount = event.GetClickCount();
       break;
+    case ET_MOUSE_ENTERED:
     case ET_MOUSE_EXITED:
-// TODO(chaopeng) this fix only for chromeos now, should convert ET_MOUSE_EXITED
-// to MouseLeave when crbug.com/450631 fixed.
-#if defined(OS_CHROMEOS)
-      webkit_event.type = blink::WebInputEvent::MouseLeave;
-      break;
-#endif
-    case ET_MOUSE_ENTERED:
     case ET_MOUSE_MOVED:
     case ET_MOUSE_DRAGGED:
       webkit_event.type = blink::WebInputEvent::MouseMove;