[Sync] Separate purge types step from sync manager configuration.

components/sync/engine/fake_sync_manager.h

Index: components/sync/engine/fake_sync_manager.h
diff --git a/components/sync/engine/fake_sync_manager.h b/components/sync/engine/fake_sync_manager.h
index 0c82ecfb47192c9ed51bcd2e9a5e2f75e1ea2503..42f0c26d1932183939e1dd14e009789d783f267b 100644
--- a/components/sync/engine/fake_sync_manager.h
+++ b/components/sync/engine/fake_sync_manager.h
@@ -76,15 +76,15 @@ class FakeSyncManager : public SyncManager {
   ModelTypeSet InitialSyncEndedTypes() override;
   ModelTypeSet GetTypesWithEmptyProgressMarkerToken(
       ModelTypeSet types) override;
-  bool PurgePartiallySyncedTypes() override;
+  void PurgePartiallySyncedTypes() override;
+  void PurgeDisabledTypes(ModelTypeSet to_purge,
+                          ModelTypeSet to_journal,
+                          ModelTypeSet to_unapply) override;
   void UpdateCredentials(const SyncCredentials& credentials) override;
   void StartSyncingNormally(const ModelSafeRoutingInfo& routing_info,
                             base::Time last_poll_time) override;
   void ConfigureSyncer(ConfigureReason reason,
                        ModelTypeSet to_download,
-                       ModelTypeSet to_purge,
-                       ModelTypeSet to_journal,
-                       ModelTypeSet to_unapply,
                        const ModelSafeRoutingInfo& new_routing_info,
                        const base::Closure& ready_task,
                        const base::Closure& retry_task) override;