Clean up style in RenderBlock::markPositionedObjectsForLayout
Clean up style in RenderBlock::markPositionedObjectsForLayout

A small cleanup of this function.

Review URL: https://codereview.chromium.org/430933002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@179261 bbb929c8-8fbe-4397-9dbb-9b2b20218538

primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs