Revert 260147 "Handling LevelDB errors encountered after open."

Revert 260147 "Handling LevelDB errors encountered after open."

The browser test is showing Mac ASAN failures.

> Handling LevelDB errors encountered after open.
>
> The previous IndexedDB implementation only checked for (and reported)
> corrupted LevelDB's during open. If they are determined to be corrupted
> during use then the database was simply closed. The page would be unaware of
> this, and would likely reopen the database at a later time (which would work)
> only to fail again during a read/write operation. There was no way for the
> page to get out of that corrupted state - the user would have to delete all
> origin data.
>
> This change will record the fact that the backing store was corrupted, and
> during open this would be read and, if present, result in the same dataLoss
> state being reported to the page in the upgradeneeded event.
>
> Also split IndexedDBBackingStore's REPORT_ERROR macro in two:
> REPORT_ERROR_UNTESTED (which calls NOTREACHED) and REPORT_ERROR. REPORT_ERROR
> is used for errors which are encountered during tests. This was done so that
> runtime errors could still be caught during a debug build run.
>
> BUG=322707
> R=isherman@chromium.org, jochen@chromium.org, jsbell@chromium.org
>
> Review URL: https://codereview.chromium.org/197333009
>
> Patch from Christopher Mumford <cmumford@chromium.org>;.

TBR=jsbell@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=260209

[jsbell, 2014-03-28 18:29:46]

Committed patchset #1 manually as r260209.