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I'm not sure whether it should be this way - maybe
waiting for the page load (WaitForPageLoad) should
imply waiting for the focus as well; but this does
fix the previously flaky test. I've clarified the
name of the test also, since all this does is to
show that the two HeadlessWebContents instances
are independently focused at the same time.

R=caseq@chromium.com, eseckler@chromium.com

Bug: 828042
Change-Id: I174863b49ae525605a6aacb8750880d02fae3246
Reviewed-on: https://chromium-review.googlesource.com/1026993Reviewed-by: Eric Seckler <eseckler@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Commit-Queue: Johannes Henkel <johannes@google.com>
Cr-Commit-Position: refs/heads/master@{#553627}