Revert 237896 "Use multiple RemoteFileSyncService depends on origin"

This might cause Linux Tests (tsan) failure.

http://build.chromium.org/p/chromium.memory.fyi/builders/Linux%20Tests%20%28tsan%29%283%29/builds/8699

> Use multiple RemoteFileSyncService depends on origin
> 
> Lazily instantiate and use v2 RemoteFileSyncService if V2 is enabled
> only for the origin.
> 
> BUG=324215
> TEST=none
> NOTRY=true
> 
> Review URL: https://codereview.chromium.org/96253002

TBR=kinuko@chromium.org

Review URL: https://codereview.chromium.org/96593003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237913 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 237913