Standardize usage of virtual/override/final in sync/

sync/api/fake_sync_change_processor.h

Index: sync/api/fake_sync_change_processor.h
diff --git a/sync/api/fake_sync_change_processor.h b/sync/api/fake_sync_change_processor.h
index 498aef82c650f771e52ffb3c5da255bf80e2c728..d9bd59649b749e413287d9875a7ab9e1a5c61273 100644
--- a/sync/api/fake_sync_change_processor.h
+++ b/sync/api/fake_sync_change_processor.h
@@ -12,29 +12,27 @@ namespace syncer {
 class FakeSyncChangeProcessor : public SyncChangeProcessor {
  public:
   FakeSyncChangeProcessor();
-  virtual ~FakeSyncChangeProcessor();
+  ~FakeSyncChangeProcessor() override;
 
   // SyncChangeProcessor implementation.
   //
   // ProcessSyncChanges will accumulate changes in changes() until they are
   // cleared.
-  virtual syncer::SyncError ProcessSyncChanges(
+  syncer::SyncError ProcessSyncChanges(
       const tracked_objects::Location& from_here,
       const syncer::SyncChangeList& change_list) override;
 
   // SyncChangeProcessor implementation.
   //
   // Returns data().
-  virtual syncer::SyncDataList GetAllSyncData(syncer::ModelType type)
-      const override;
+  syncer::SyncDataList GetAllSyncData(syncer::ModelType type) const override;
 
   // SyncChangeProcessor implementation.
   //
   // Updates context().
-  virtual syncer::SyncError UpdateDataTypeContext(
-      ModelType type,
-      ContextRefreshStatus refresh_status,
-      const std::string& context) override;
+  syncer::SyncError UpdateDataTypeContext(ModelType type,
+                                          ContextRefreshStatus refresh_status,
+                                          const std::string& context) override;
 
   virtual const syncer::SyncChangeList& changes() const;
   virtual syncer::SyncChangeList& changes();