Update ui::PointerEvent to support mouse wheel and capture change events.

ash/shared/immersive_fullscreen_controller.cc

Index: ash/shared/immersive_fullscreen_controller.cc
diff --git a/ash/shared/immersive_fullscreen_controller.cc b/ash/shared/immersive_fullscreen_controller.cc
index 1af174bee4be1412beda419387f14f5cbb5b7d24..bf26c2cb5ead4eaff35e53ee439896b887f54312 100644
--- a/ash/shared/immersive_fullscreen_controller.cc
+++ b/ash/shared/immersive_fullscreen_controller.cc
@@ -243,13 +243,6 @@ void ImmersiveFullscreenController::OnPointerEventObserved(
   }
 }
 
-void ImmersiveFullscreenController::OnMouseCaptureChanged() {
-  const ui::MouseEvent event(ui::ET_MOUSE_CAPTURE_CHANGED, gfx::Point(),
-                             gfx::Point(), ui::EventTimeForNow(), 0, 0);
-  OnMouseEvent(event, display::Screen::GetScreen()->GetCursorScreenPoint(),
-               nullptr);
-}
-
 ////////////////////////////////////////////////////////////////////////////////
 // views::WidgetObserver overrides: