[Sync] Remove unneeded 'using syncer::' lines and 'syncer::' scopings

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 6118a9196a81235f8122780314768ef5d519b2a0..5f84d852f8feef3f6710d60f1ed481011a5b87b2 100644
--- a/sync/api/syncable_service.h
+++ b/sync/api/syncable_service.h
@@ -37,18 +37,18 @@ class SyncableService : public SyncChangeProcessor,
   //          encountered, and a filled SyncError (IsSet() == true)
   //          otherwise.
   virtual SyncError MergeDataAndStartSyncing(
-      syncer::ModelType type,
+      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(syncer::ModelType type) = 0;
+  virtual void StopSyncing(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(syncer::ModelType type) const = 0;
+  virtual SyncDataList GetAllSyncData(ModelType type) const = 0;
 
   // SyncChangeProcessor interface.
   // Process a list of new SyncChanges and update the local data as necessary.