[Sync] Move ModelType and related classes to 'syncer' namespace

sync/api/syncable_service.h

Index: sync/api/syncable_service.h
diff --git a/sync/api/syncable_service.h b/sync/api/syncable_service.h
index 2093047bcfb752c05c8d1fe63503b1465274052d..c3b2589c2b86abb0f7aa022bd23aa3f5eca53399 100644
--- a/sync/api/syncable_service.h
+++ b/sync/api/syncable_service.h
@@ -38,18 +38,18 @@ class SyncableService : public SyncChangeProcessor,
   //          encountered, and a filled SyncError (IsSet() == true)
   //          otherwise.
   virtual SyncError MergeDataAndStartSyncing(
-      syncable::ModelType type,
+      syncer::ModelType type,
       const SyncDataList& initial_sync_data,
       scoped_ptr<SyncChangeProcessor> sync_processor,
       scoped_ptr<SyncErrorFactory> error_handler) = 0;
 
   // Stop syncing the specified type and reset state.
-  virtual void StopSyncing(syncable::ModelType type) = 0;
+  virtual void StopSyncing(syncer::ModelType type) = 0;
 
   // Fills a list of SyncData from the local data. This should create an up
   // to date representation of the SyncableService's view of that datatype, and
   // should match/be a subset of the server's view of that datatype.
-  virtual SyncDataList GetAllSyncData(syncable::ModelType type) const = 0;
+  virtual SyncDataList GetAllSyncData(syncer::ModelType type) const = 0;
 
   // SyncChangeProcessor interface.
   // Process a list of new SyncChanges and update the local data as necessary.