[CodeHealth] Remove outdated comment in HitTestQuery

The drag and drop issue with Viz hit testing has been fixed in
crrev.com/c/1693442.

Bug: None
Change-Id: Ifbca617f1a0391dc6bd6465d0ee0de1c1aba3d5e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1761776Reviewed-by: kylechar <kylechar@chromium.org>
Commit-Queue: Yi Gu <yigu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688717}

components/viz/host/hit_test/hit_test_query.cc

@@ -231,8 +231,6 @@ bool HitTestQuery::FindTargetInRegionForLocation(
   DCHECK_EQ(!!(flags & HitTestRegionFlags::kHitTestAsk),
             !!hit_test_data_[region_index].async_hit_test_reasons);
 
-  // TODO(sunxd): v2 doesn't work with drag-n-drop when it still relies on
-  // synchronous targeting result for nested OOPIF cases. crbug.com/896786
   if (features::IsVizHitTestingSurfaceLayerEnabled() &&
       ((flags & HitTestRegionFlags::kHitTestAsk) &&
        !(flags & HitTestRegionFlags::kHitTestIgnore))) {