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This CL renames "Enable Compositor Threaded Scrollbar Scrolling" to
"Compositor Threaded Scrollbar Scrolling". The flag already has options
to enable/disable it. Hence the "Enable" part of the flag name can be
removed for improved readability.

Bug: 962715

Change-Id: If955ec074b2bd77b7b1a22f4102068950d4c2dff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1598344Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Rahul Arakeri <arakeri@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#659288}