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The INPUT_EVENT_LATENCY_ACK_RWH_COMPONENT component is set from the
browser, and immediately looked up in the same cycle. So remove the
component, and use the timestamp directly instead.

BUG=849719

Change-Id: Id28352d7ad0f56c5b0b89df26c9aa45d3d190f55
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2093019
Commit-Queue: Ken Buchanan <kenrb@chromium.org>
Auto-Submit: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748271}