Revert of [PasswordManager] Move the sync-password-related methods to the sync layer...

Revert of [PasswordManager] Move the sync-password-related methods to the sync layer (patchset #15 id:320001 of https://codereview.chromium.org/1282023002/ )

Reason for revert:
This seems to break Win x64 GN (dbg):
http://build.chromium.org/p/chromium.win/builders/Win%20x64%20GN%20%28dbg%29/builds/8771

Original issue's description:
> [PasswordManager] Move the sync-password-related methods to the sync layer
>
> Instead of asking PasswordManagerClient about whether a password is a sync credential, and the client delegating this to sync_metrics in //chrome/browser/*, the client interface should delegate this to the code in the sync layer of the password_manager component.
>
> TODOs for follow-up CLs:
> (1) SyncStoreResultFilter needs to be renamed to SyncCredentialsFilter.
> (2) PasswordManager.SyncCredentialFiltered histogram needs a better description.
>
> BUG=515108,474577,514230
>
> Committed: https://crrev.com/5b5a8b4dbf5c7916fcdfe3de744eb5679914b14b
> Cr-Commit-Position: refs/heads/master@{#346631}

TBR=pavely@chromium.org,rogerta@chromium.org,engedy@chromium.org,atwilson@chromium.org,bauerb@chromium.org,blundell@chromium.org,vabr@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=515108,474577,514230

Review URL: https://codereview.chromium.org/1315503007

Cr-Commit-Position: refs/heads/master@{#346635}