Move shortcuts_database.{cc,h} to //chrome/browser/autocomplete

Move shortcuts_database.{cc,h} to //chrome/browser/autocomplete

The sole client of ShortcutsDatabase is ShortcutsBackend and the
implementation of ShortcutsDatabase does not depends on //c/b/history
so it makes more sense to put this code in //c/b/autocomplete.

All files were moved using tools/git/move_source_files.py and then the
build system files (gyp and gn) were manually editted.

BUG=370850, 371538
Committed: https://crrev.com/a3b96025c9fea20795c11664978fc2bca98cd651
Cr-Commit-Position: refs/heads/master@{#309920}

[sdefresne, 2014-12-29 22:41:10]

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

[sdefresne, 2014-12-29 22:41:11]

sky: can you review since you are OWNERS of both //chrome/browser/history and
//chrome/browser/autocomplete.

I don't really know why shortcuts_database.{cc,h} are in
//chrome/browser/history. I guess it was for historical reason, but looking at
the code it does not make sense, and //chrome/browser/autocomplete looks like a
better location for that code.

[tfarina, 2014-12-29 22:59:38]

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

[tfarina, 2014-12-29 22:59:38]

+Peter for autocomplete review!

[Peter Kasting, 2014-12-30 05:20:27]

Originally, both ShortcutsBackend and ShortcutsDatabase were in c/b/history/, I
think because other code in history referenced one or both of them.

If no code in the history system references these, then I'm OK with them moving.
 LGTM

[sdefresne, 2015-01-05 17:45:06]

The CQ bit was checked by sdefresne@chromium.org

[commit-bot: I haz the power, 2015-01-05 17:45:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/830503003/40001

[commit-bot: I haz the power, 2015-01-05 17:59:27]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-01-05 18:00:37]

Patchset 3 (id:??) landed as
https://crrev.com/a3b96025c9fea20795c11664978fc2bca98cd651
Cr-Commit-Position: refs/heads/master@{#309920}