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Ash is no longer built on Windows.
Also cleanup DragDropControllerTest.

Bug: NONE
Change-Id: I73b3ce606aca98abc6248f7cf8356c6307a785b6
Reviewed-on: https://chromium-review.googlesource.com/723866Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Michael Wasserman <msw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#509543}