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

ui/events/blink/web_input_event.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/events/blink/web_input_event.h"
 
 #include "ui/events/base_event_utils.h"
 #include "ui/events/blink/blink_event_util.h"
 #include "ui/events/event.h"
 #include "ui/events/event_utils.h"
@@ skipping 381 matching lines @@
 
   switch (event.type()) {
     case ET_MOUSE_PRESSED:
       webkit_event.type = blink::WebInputEvent::MouseDown;
       webkit_event.clickCount = event.GetClickCount();
       break;
     case ET_MOUSE_RELEASED:
       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;
       break;
     default:
       NOTIMPLEMENTED() << "Received unexpected event: " << event.type();
       break;
   }
 
   webkit_event.tiltX = roundf(event.pointer_details().tilt_x);
@@ skipping 23 matching lines @@
   webkit_event.tiltX = roundf(event.pointer_details().tilt_x);
   webkit_event.tiltY = roundf(event.pointer_details().tilt_y);
   webkit_event.force = event.pointer_details().force;
   webkit_event.pointerType =
       EventPointerTypeToWebPointerType(event.pointer_details().pointer_type);
 
   return webkit_event;
 }
 
 }  // namespace ui