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When the default search engine is changed, chrome://newtab is loaded on
the tabs with a NTP loaded. chrome://newtab will redirect to the NTP
associated with the new default search engine.

Bug: 1129499
Change-Id: I03360bb781c7bf94e2db65f282ee163386dd26cc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2423169Reviewed-by: Tibor Goldschwendt <tiborg@chromium.org>
Commit-Queue: Esmael Elmoslimany <aee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809479}