Revert 241341 "[sql] Diagnostic to track recovery crash."

Never fired, this hypothesis was mistaken.

> [sql] Diagnostic to track recovery crash.
> 
> There are some crashes happening in leafCursorCellDecode() which imply
> that the leaf cursor is NULL.  AFAICT, this case is not possible.  Add
> some code to verify whether the leaf cursor was NULL at the point it was
> added to the virtual-table cursor.  If the crash moves, then there's
> something wrong with leafCursorCreate(), if the crash stays in place,
> there's something happening in the SQLite virtual table infrastructure.
> 
> BUG=326646
> 
> Review URL: https://codereview.chromium.org/109123002

TBR=shess@chromium.org

Review URL: https://codereview.chromium.org/107173005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@242685 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 242685