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LayerTreeFrameSinkClient::DidNotNeedBeginFrame() is never used
from LayerTreeFrameSink instances. So it is removed. However,
LayerTreeHostImpl::DidNotNeedBeginFrame() is still used to notify
when the compositor stops asking for begin-frames, so keep it as
a direct member function.

BUG=none
TBR=oshima@ for mechanical changes in ash/ and components/exo

Change-Id: Ia5b7dac845e12a487e25f635cdc6ee9d8de2bd26
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1692485
Commit-Queue: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: kylechar <kylechar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#675741}