[RLS] Remove deadcode from LocalFrameView

This patch removes:
LocalFrameView::IsEnclosedInCompositingLayer
LocalFrameView::UpdateLayersAndCompositingAfterScrollIfNeeded

Incidentally, this removes the last DisableCompositingQueryAsserts
from LocalFrameView.

Bug: 823365
Change-Id: I2cc8ef49252be320b994578570919ff5b2a34586
Reviewed-on: https://chromium-review.googlesource.com/1072908
Commit-Queue: Philip Rogers <pdr@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#561911}
2 files changed