[sql] Retry Open() if error handler fixed things.

[sql] Retry Open() if error handler fixed things.

Since the caller cannot have existing database-derived state before
the database is opened, Open() can be safely retried after the error
handler has razed the database.

BUG=109482
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=211936

[Scott Hess - ex-Googler, 2013-07-16 21:15:43]

Starting to wire the pieces together.  The recovery code will also poison
things, so with this in place clients should be able to successfully open a
certain number of databases without having to wait for another restart.  For the
thumbnail database, about 1/4 of corruptions are detected immediately in open
(probably due to file length mismatches).

[erikwright (departed), 2013-07-16 23:49:24]

LGTM.

[commit-bot: I haz the power, 2013-07-17 00:06:53]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/shess@chromium.org/18641004/3001

[commit-bot: I haz the power, 2013-07-17 04:45:17]

Change committed as 211936