Speculative fixes for search engine crashes.

Speculative fixes for search engine crashes.

1.) We were not listening for changes from the template
    URL service, which seems more likely to happen with
    custom engine support.
2.) We were setting the search engine on initialization and
    "maybe" that changed the underlying data so some keywords
    were dropped.

BUG=670250
Review-Url: https://codereview.chromium.org/2655333003
Cr-Commit-Position: refs/heads/master@{#446866}
(cherry picked from commit ea757161c1067010f73c9ab922d867a6648b202f)

Review-Url: https://codereview.chromium.org/2670623003 .
Cr-Commit-Position: refs/branch-heads/2987@{#257}
Cr-Branched-From: ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}
Committed: https://chromium.googlesource.com/chromium/src/+/ffc47f4bf55761edb7c15260d8a3fa6416d53715

[Ted C, 2017-02-01 23:57:52]

Description was changed from

==========
Speculative fixes for search engine crashes.

1.) We were not listening for changes from the template
    URL service, which seems more likely to happen with
    custom engine support.
2.) We were setting the search engine on initialization and
    "maybe" that changed the underlying data so some keywords
    were dropped.

BUG=670250

Review-Url: https://codereview.chromium.org/2655333003
Cr-Commit-Position: refs/heads/master@{#446866}
(cherry picked from commit ea757161c1067010f73c9ab922d867a6648b202f)
==========

to

==========
Speculative fixes for search engine crashes.

1.) We were not listening for changes from the template
    URL service, which seems more likely to happen with
    custom engine support.
2.) We were setting the search engine on initialization and
    "maybe" that changed the underlying data so some keywords
    were dropped.

BUG=670250

Review-Url: https://codereview.chromium.org/2655333003
Cr-Commit-Position: refs/heads/master@{#446866}
(cherry picked from commit ea757161c1067010f73c9ab922d867a6648b202f)

Review-Url: https://codereview.chromium.org/2670623003 .
Cr-Commit-Position: refs/branch-heads/2987@{#257}
Cr-Branched-From:
ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}
Committed:
https://chromium.googlesource.com/chromium/src/+/ffc47f4bf55761edb7c15260d8a3...
==========

[Ted C, 2017-02-01 23:57:54]

Committed patchset #1 (id:1) manually as
ffc47f4bf55761edb7c15260d8a3fa6416d53715.