Revert 284234 "Pass signin_scoped_device_id to DeviceInfoSpecifics."

Revert 284234 "Pass signin_scoped_device_id to DeviceInfoSpecifics."
Compilation error on Win builder.

src\sync\internal_api\public\base\invalidation_util.cc(14) : fatal error C1083: Cannot open include file: 'google/cacheinvalidation/types.pb.h': No such file or directory

> Pass signin_scoped_device_id to DeviceInfoSpecifics.
> 
> I'm adding signin_scoped_device_id to DeviceInfoSpecifics.
> This value is available from SigninClient, the rest of code is to pass
> value from syncBackendHostImpl where SigninClient is availble to
> SyncedDeviceTracker where value is passed to protobuf.
> 
> Also there is small change to how commandline flag is handled.
> 
> BUG=382968
> R=rlarocque@chromium.org
> 
> Review URL: https://codereview.chromium.org/395013002

TBR=pavely@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=284242

[Vitaly Buka (NO REVIEWS), 2014-07-18 23:06:22]

Committed patchset #1 manually as r284242 (tree was closed).