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Just instantiating a UrlLoadObserver does nothing useful; you have to
actually call .Wait() on it.
It turns out that when waiting for an NTP load, the tests were trying to
verify the wrong thing: The load doesn't actually end up at
chrome://newtab, but at chrome-search://local-ntp/local-ntp.html.

Bug: none
Change-Id: I126d3a3ae2ce07c3424326a8c3c8eaecbc97491b
Reviewed-on: https://chromium-review.googlesource.com/1126299
Commit-Queue: Marc Treib <treib@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#573665}