sync: Implement disabling of non blocking types

sync/internal_api/public/sync_core_proxy.h

Index: sync/internal_api/public/sync_core_proxy.h
diff --git a/sync/internal_api/public/sync_core_proxy.h b/sync/internal_api/public/sync_core_proxy.h
index 5ec8efeef5fed39b32d3aac30e8e590c8af01fcf..3286141c75a969609cffb23e2c596c0b9306faea 100644
--- a/sync/internal_api/public/sync_core_proxy.h
+++ b/sync/internal_api/public/sync_core_proxy.h
@@ -27,6 +27,9 @@ class SYNC_EXPORT_PRIVATE SyncCoreProxy {
       syncer::ModelType type,
       base::WeakPtr<NonBlockingTypeProcessor> type_processor) = 0;
 
+  // Disables sync for the given non-blocking type on the sync core.

[Nicolas Zea, 2014/05/12 19:09:10]

I find "Disables .. on the sync core" to be kind of confusing. Perhaps
"Disconnects the non-blocking type from the sync core" is clearer

[rlarocque, 2014/05/12 20:02:13]

Done.

+  virtual void Disconnect(syncer::ModelType type) = 0;
+
   // Creates a clone of this SyncCoreProxy.
   virtual scoped_ptr<SyncCoreProxy> Clone() const = 0;
 };