Bug 1166301 - Update an old comment in AsyncCompositionManager::AlignFixedAndStickyLayers. r=kats

--HG--
extra : rebase_source : b69104a407c62a3f25e708b172c8e51eac7e9295
extra : source : 2a98e76921bb905d750a2e36e6057a5bb6f4fd41

gfx/layers/composite/AsyncCompositionManager.cpp

@@ -284,13 +284,10 @@ AsyncCompositionManager::AlignFixedAndStickyLayers(Layer* aLayer,
   bool isFixedOrSticky = (isRootFixedForSubtree || isStickyForSubtree);
 
   // We want to process all the fixed and sticky children of
-  // aTransformedSubtreeRoot. Also, once we do encounter such a child, we don't
-  // need to recurse any deeper because the fixed layers are relative to their
-  // nearest scrollable layer.
+  // aTransformedSubtreeRoot. Once we do encounter such a child, we don't
+  // need to recurse any deeper because the adjustment to the fixed or sticky
+  // layer will apply to its subtree.
   if (!isFixedOrSticky) {
-    // ApplyAsyncContentTransformToTree will call this function again for
-    // nested scrollable layers, so we don't need to recurse if the layer is
-    // scrollable.
     for (Layer* child = aLayer->GetFirstChild(); child; child = child->GetNextSibling()) {
       AlignFixedAndStickyLayers(child, aTransformedSubtreeRoot, aTransformScrollId,
                                 aPreviousTransformForRoot,