Remove DCHECK in scroll metrics recording

This is causing crashes in debug builds. Comment out for now so that it
allows running with DCHECKs enabled while we investigate.

Bug: 944706
Change-Id: I4ff0d604dc52c8893898195c6843e95d91b5598a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1617881
Commit-Queue: Navid Zolghadr <nzolghadr@chromium.org>
Auto-Submit: David Bokan <bokan@chromium.org>
Reviewed-by: Navid Zolghadr <nzolghadr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#660945}

third_party/blink/renderer/core/input/scroll_manager.cc

@@ -381,8 +381,9 @@ void ScrollManager::ComputeScrollRelatedMetrics(
     if (!scrollable_area || !scrollable_area->ScrollsOverflow())
       continue;
 
-    DCHECK(!scrollable_area->UsesCompositedScrolling() ||
-           !scrollable_area->GetNonCompositedMainThreadScrollingReasons());
+    // TODO(bokan): This DCHECK is occasionally tripped. See crbug.com/944706.
+    // DCHECK(!scrollable_area->UsesCompositedScrolling() ||
+    //        !scrollable_area->GetNonCompositedMainThreadScrollingReasons());
     *non_composited_main_thread_scrolling_reasons |=
         scrollable_area->GetNonCompositedMainThreadScrollingReasons();
   }