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Currently, the ChromeDriver water shows green status even when some
tests have failed. Updating the build script to fix that.

Bug: 768880
Change-Id: I5f3ccadd00a119390dd9fbd625172f987a1100eb
Reviewed-on: https://chromium-review.googlesource.com/809726
Commit-Queue: John Chen <johnchen@chromium.org>
Reviewed-by: Shuotao Gao <stgao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523552}