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crrev.com/c/2032038 revealed that android_browsertests are opening
the NTP on initialization rather than about:blank. This caused issues
w/ the switch from the old NTP to start surface, which doesn't have
an associated WebContents.

This CL instead always opens the initial tab in android_browsertests
on about:blank, which should ensure that an actual Tab (and
WebContents) are created regardless of whether we're using the NTP
or start surface.

Change-Id: I5a87e3093a5f78ea76179fe605b859df9dc3b193
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2065331
Commit-Queue: John Budorick <jbudorick@chromium.org>
Reviewed-by: Yusuf Ozuysal <yusufo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743389}