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If a test inherits from RenderViewHostTestHarness but provides its own
implementation of TearDown() it may forget to call the version from its
parent class. This DCHECK provides a better error message to alert the
developer to their error.

Bug: 1163761
Change-Id: Ia2341253e511a28dd6a6bad695a9bccc5abafed8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2616963
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Auto-Submit: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841764}