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This is a UI performance test to measure the input latency for
dragging window/tab in tablet-mode. However it has been disabled
for a while due to flakiness.

As I revisited this, I've realized that the expected behaviors
have changed significantly due to WebUITabStrip. The test scenario
looks irrelevant at all.

It would be just okay to simply remove the entire file.

Bug: 1031526, 1028386, 1057868
Test: none
Change-Id: I3ff5663acf8b65d799ca7490ce3287005cb6efd8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2118892Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Jun Mukai <mukai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#753259}