Update a comment to reflect new file names

Change-Id: I97f014c264329c94dba9c576105f135c4faed8a1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1935868
Commit-Queue: Navid Zolghadr <nzolghadr@chromium.org>
Auto-Submit: Navid Zolghadr <nzolghadr@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#718989}

third_party/blink/renderer/core/layout/layout_object.h

@@ -152,7 +152,7 @@ const int kShowTreeCharacterOffset = 39;
 // The purpose of the layout tree is to do layout (aka reflow) and store its
 // results for painting and hit-testing. Layout is the process of sizing and
 // positioning Nodes on the page. In Blink, layouts always start from a relayout
-// boundary (see objectIsRelayoutBoundary in LayoutObject.cpp). As such, we
+// boundary (see ObjectIsRelayoutBoundary in layout_object.cc). As such, we
 // need to mark the ancestors all the way to the enclosing relayout boundary in
 // order to do a correct layout.
 //