sync: Retry soon when server returns conflict

When the server gives us a conflict response, we ought to fetch updates
in order to figure out what the server is complaining about, resolve any
conflicts locally, then re-commit.

The current syncer, although not intentionally built to handle this
scenario, does the right thing.  It considers the server's return code
to be indicative of a transient error, so it backs off then retries
later.  The retry sync cycle will fetch updates, resolve conflicts, and
recommit, which is exactly what we want.  Unfortunately, the backoff can
take five minutes.

This commit reduces the time spent unnecessarily backing off.  It's not
the cleanest solution, but its implementation is easy and safe.

BUG=157955


Review URL: https://chromiumcodereview.appspot.com/11411041

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@169158 0039d316-1c4b-4281-b951-d872f2087c98

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