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This cl does the following
1. Move code from /chrome/services/local_search_service
to /chrome/browser/chromeos/local_search_service

2. Rename classes by dropping "Impl" suffices.

3. Update client code for the above.

For ease of review, please diff base & patch 1 to see
code move; diff patch 1 & patch 2 to see class renaming.
Direct diff between base and patch 2 will introduce spurious
changes (i.e. deleting two files and adding two new files
that are actually really moving files + modifications).

Bug: 1064424,1018613
Change-Id: Ic338f23bffc149416b33ed9776de53b7cc0b442a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2159177
Commit-Queue: Jia Meng <jiameng@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#761850}