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Previously requests for promos and the OGB were not sent until
the NTP had almost finished loading. Instead start these requests
when the request for the main HTML page is received.

With this change promos and the OBG will appear along with search
suggestions and the most visited tiles if they're available (which
is now fairly likely). Otherwise they will appear once ready.

Also removes a console error when the OGB failed to load.

Bug: 770640
Change-Id: Iff7a29a002325853115678f12c89c29869c076e5
Reviewed-on: https://chromium-review.googlesource.com/c/1476148
Commit-Queue: Kyle Milka <kmilka@chromium.org>
Reviewed-by: Kristi Park <kristipark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636345}