GitLab

Pulls out the core of gbillock's http://codereview.chromium.org/8283002/
- Move NOTREACHED and similar checks into the sql:: implementation code.
- Add malformed SQL checks to Connection::Execute.
- Add SQL-checking convenience methods to Connection.

The general idea is that the sql:: framework assumes valid statements,
rather than having client code contain scattered ad-hoc (and thus
inconsistent) checks.

This version puts back Statement operator overloading and loosy-goosy
Execute() calls to allow other code to be updated in small batches.

R=gbillock@chromium.org,jhawkins@chromium.org,dhollowa@chromium.org 
BUG=none
TEST=sql_unittests,unit_tests:*Table*.*


Review URL: http://codereview.chromium.org/8899012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@114118 0039d316-1c4b-4281-b951-d872f2087c98