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Previously calling -loadURL immediately after loading an NTP in
a test would yield expected ios/web callbacks.  With a non-native
content NTP, -loadURL must be called after the NTP webState load
completes.  This is similar to loading any other web site.

Bug: 826369
Change-Id: Ice1364aee6299ab00b5fd9f0188e56ab0c73095c
Reviewed-on: https://chromium-review.googlesource.com/c/1316591Reviewed-by: Peter Lee <pkl@chromium.org>
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605192}