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This reverts commit 06b8660d.

Reason for revert: Hitting DCHECK: [FATAL:latency_tracker.cc(399)] Check failed: (event_timestamp - last_event_timestamp_).InMilliseconds() >= 0

Original change's description:
> Use mocked VR controller for scrolling
> 
> Switches all VR instrumentation tests for scrolling using the Daydream
> controller to use the Chrome-side controller mock instead of the
> VrCore-side emulation via intents. The latter has always been somewhat
> flaky, so this should help reduce VR test flakiness.
> 
> Bug: 902938
> Change-Id: I560cda2129357c49bdfa3d095836e6ebd1b23da8
> Reviewed-on: https://chromium-review.googlesource.com/c/1341061
> Reviewed-by: Christopher Grant <cjgrant@chromium.org>
> Reviewed-by: Ian Vollick <vollick@chromium.org>
> Commit-Queue: Ian Vollick <vollick@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#613107}

TBR=vollick@chromium.org,cjgrant@chromium.org,bsheedy@chromium.org

Change-Id: I40d8cf660d35a14ee4269010f5da749a2e91daad
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 902938
Reviewed-on: https://chromium-review.googlesource.com/c/1359311Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613272}