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To load the NTP faster, we include config.js data in the local ntp
page's initial resources instead of later added by local_ntp.js

To achieve this, we refactor into the SearchConfigProvider and cache
the config data. It will be recomputed on Search provider change.

We also now declare the CSP as part of a <meta> tag instead of headers,
since in URLDataSource the headers are created on the IO thread and
the response on the UI thread. Doing everything in the local_ntp.html
response avoids races nicely.

Bug: 868432
Change-Id: Iab38ca2b2e032a58c2d404938065a612b08cc69a
Reviewed-on: https://chromium-review.googlesource.com/1154687Reviewed-by: Chris Palmer <palmer@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Mathieu Perreault <mathp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579553}