[iOS] Upstream UpdateSearchEnginesIfNeeded

[iOS] Upstream UpdateSearchEnginesIfNeeded

On iOS when user chaneg the device locale, we update the list of search
engines keeping the currently selected search engine unchanged. This is
done by removing all other search engines, and then adding the new ones.

BUG=None

Committed: https://crrev.com/8abf4df08fd2bcfb7f2f651bc539bad03060091e
Cr-Commit-Position: refs/heads/master@{#330913}

[sdefresne, 2015-05-20 13:01:43]

sdefresne@chromium.org changed reviewers:
+ noyau@chromium.org

[sdefresne, 2015-05-20 13:01:43]

noyau: Please take a look.

pkasting: OWNERS approval for new DEPS on //components/search_engines

[noyau (Ping after 24h), 2015-05-20 13:17:43]

lgtm

[sdefresne, 2015-05-20 14:05:32]

sdefresne@chromium.org changed reviewers:
+ pkasting@chromium.org

[sdefresne, 2015-05-20 14:05:43]

pkasting: OWNERS approval for new DEPS on //components/search_engines

[Peter Kasting, 2015-05-20 19:54:37]

LGTM

[sdefresne, 2015-05-21 07:53:20]

The CQ bit was checked by sdefresne@chromium.org

[commit-bot: I haz the power, 2015-05-21 07:53:32]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1149623002/1

[commit-bot: I haz the power, 2015-05-21 07:57:19]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-21 07:58:42]

Patchset 1 (id:??) landed as
https://crrev.com/8abf4df08fd2bcfb7f2f651bc539bad03060091e
Cr-Commit-Position: refs/heads/master@{#330913}