Update DesktopLinuxBrowserFrameView::Layout Comment

The Relayout() code has been moved a lot. The comment is now current
as of this revision

BUG=
TBR=thomasanderson@chromium.org

Change-Id: Ieb391af093a40a9b42dbfbbfc1e6160ab6c93547
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1848581Reviewed-by: Robert Liao <robliao@chromium.org>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Robert Liao <robliao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704016}

chrome/browser/ui/views/frame/desktop_linux_browser_frame_view.cc

@@ -27,8 +27,8 @@ DesktopLinuxBrowserFrameView::~DesktopLinuxBrowserFrameView() {}
 void DesktopLinuxBrowserFrameView::Layout() {
   // Calling MaybeUpdateCachedFrameButtonImages() from Layout() is sufficient to
   // catch all cases that could update the appearance, since
-  // DesktopWindowTreeHostX11::UpdateWindowProperties() does a layout any time
-  // any properties change.
+  // DesktopWindowTreeHostPlatform::OnWindowStateChanged() does a layout any
+  // time any properties change.
   MaybeUpdateCachedFrameButtonImages();
   OpaqueBrowserFrameView::Layout();
 }