Bug 1673492 - Downgrade the assertion about two layers that scroll together having different ancestor transforms, to an NS_ASSERTION. r=kats

Differential Revision: https://phabricator.services.mozilla.com/D94787

gfx/layers/apz/src/APZCTreeManager.cpp

@@ -1397,7 +1397,7 @@ HitTestingTreeNode* APZCTreeManager::PrepareNodeForLayer(
       typedef TreeBuildingState::DeferredTransformMap::value_type PairType;
       if (!aAncestorTransform.ContainsPerspectiveTransform() &&
           !apzc->AncestorTransformContainsPerspective()) {
-        MOZ_ASSERT(false,
+        NS_ASSERTION(false,
                      "Two layers that scroll together have different ancestor "
                      "transforms");
       } else if (!aAncestorTransform.ContainsPerspectiveTransform()) {