Revert "Fix flatbuffers_unittests failure-mode"

This reverts commit 108146f8586ca33b6aa5bb3d28353e5a45d4b0e3.

Reason for revert: See https://bugs.chromium.org/p/chromium/issues/detail?id=938020#c6

Original change's description:
> Fix flatbuffers_unittests failure-mode
> 
> This is failing on Win7 Tests (dbg)(1):
> https://ci.chromium.org/p/chromium/builders/ci/Win7%20Tests%20%28dbg%29%281%29?limit=200
> 
> Failures are causing python errors because the "failures" element must be a list.
> The actual cause of the failure is not yet known.
> 
> Bug: 938020
> Change-Id: I53742dbf49f97a8828af5675a0360e431ed376c8
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1503614
> Reviewed-by: Dirk Pranke <dpranke@chromium.org>
> Commit-Queue: Charlie Harrison <csharrison@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#637839}

TBR=dpranke@chromium.org,csharrison@chromium.org

Change-Id: Iebb35ee8e42272f742497b25713d0927fb00ff14
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 938020
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1504597
Reviewed-by: Darren Shen <shend@chromium.org>
Commit-Queue: Darren Shen <shend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#637997}
1 file changed