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All search engines are described in prepopulated_engines.json. In
template_url_prepopulate_data.cc there was an array kAllEngines
consisted of them, created by enumeration. There is a danger of
modifying prepopulated_engines.json without modifying this array. This
changes contain automatical generation of kAllEngines.

Change-Id: Idc78552372f73b07fc7070fff66c000a30c6a6ca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1807312Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Commit-Queue: Alexander Yashkin <a-v-y@yandex-team.ru>
Cr-Commit-Position: refs/heads/master@{#701133}