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This was needed previously at the end of some tests otherwise there will
be a memory leak. The introduction of SplitViewTestWindowDelegate makes
this not needed anymore.

Test: ash_unittests SplitView* with asan and without
Bug: 766725
Change-Id: I4e9754f541719fa23250ee7f691d345f5e58bdc5
Reviewed-on: https://chromium-review.googlesource.com/744291Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#512587}