Remove unreachable code in RenderLayer
Remove unreachable code in RenderLayer

The condition can't happen since if the position is FixedPosition
the function would have returned earlier.

BUG=None

Review URL: https://codereview.chromium.org/808053002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@187351 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