Revert 235611 "[SyncFS] Implement LargestKnownChangeID handling"

> [SyncFS] Implement LargestKnownChangeID handling
> 
> BUG=240165
> R=kinuko@chromium.org, nhiroki@chromium.org
> 
> Review URL: https://codereview.chromium.org/63243004

TBR=tzik@chromium.org

Review URL: https://codereview.chromium.org/72453003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@235613 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 235613
Updating trunk VERSION from 1712.0 to 1713.0

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@235615 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 235615