GitLab

Split existing tests for custom backgrounds out from general
SimpleJavascriptTests. These tests were never being run anways,
as they didn't start with 'test'.

Update local_ntp_browsertest.html with changes from local_ntp.html.

Bug: 857256
Change-Id: I251abfdc8aec75d896118d4ce0b251831b2bff43
Reviewed-on: https://chromium-review.googlesource.com/1184143
Commit-Queue: Kyle Milka <kmilka@chromium.org>
Reviewed-by: Kristi Park <kristipark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585245}