Remove unused pre-root-layer-scrolling code.

PendingOffsetToScroll was previously used to store where the layout box
was being scrolled to. There was a pre-RLS fixup to this value but it's
no longer set to anything other than its initial value so this CL
removes the entire value.

Bug: 823365,741830
Change-Id: I4d4090b629ad614bf691ea6360240fea7d43982d
Reviewed-on: https://chromium-review.googlesource.com/c/1305818
Reviewed-by: Sandra Sun <sunyunjia@chromium.org>
Commit-Queue: David Bokan <bokan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603915}
2 files changed