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The meaning of the parameter was not obvious at callsites, confusing
with layer's element id. Also the parameter was used in tests only,
and we already have SetScrollElementId() for the same purpose.

Change-Id: I62b0b6ad732389b419f351ac266cfdec73742fdc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1839034
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Commit-Queue: Philip Rogers <pdr@chromium.org>
Auto-Submit: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702645}