Revert of [Sync] Move //components/sync to the syncer namespace. (patchset #5 id:40001 of https://co

components/sync/engine_impl/sync_scheduler.h

Index: components/sync/engine_impl/sync_scheduler.h
diff --git a/components/sync/engine_impl/sync_scheduler.h b/components/sync/engine_impl/sync_scheduler.h
index 1133f073c394784c1b418aa9079cd192b3f6f48e..cb4e36b705aece8c99a1844b13bcfe625ed31660 100644
--- a/components/sync/engine_impl/sync_scheduler.h
+++ b/components/sync/engine_impl/sync_scheduler.h
@@ -131,7 +131,7 @@ class SyncScheduler : public SyncCycle::Delegate {
   // careful to pass along the "hints" delivered with those invalidations) in
   // order to fetch the update.
   virtual void ScheduleInvalidationNudge(
-      ModelType type,
+      syncer::ModelType type,
       std::unique_ptr<InvalidationInterface> invalidation,
       const tracked_objects::Location& nudge_location) = 0;
 
@@ -141,7 +141,7 @@ class SyncScheduler : public SyncCycle::Delegate {
   // configure mode, but a few of them are able to perform their initial sync
   // while the scheduler is in normal mode.  This non-blocking initial sync
   // can be requested through this function.
-  virtual void ScheduleInitialSyncNudge(ModelType model_type) = 0;
+  virtual void ScheduleInitialSyncNudge(syncer::ModelType model_type) = 0;
 
   // Change status of notifications in the SyncCycleContext.
   virtual void SetNotificationsEnabled(bool notifications_enabled) = 0;