[Sync] Move sessions/ to engine/cycle/ and rename things to match.

components/sync/engine_impl/directory_update_handler.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_SYNC_ENGINE_IMPL_DIRECTORY_UPDATE_HANDLER_H_
 #define COMPONENTS_SYNC_ENGINE_IMPL_DIRECTORY_UPDATE_HANDLER_H_
 
 #include <map>
 #include <memory>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "components/sync/base/model_type.h"
 #include "components/sync/base/syncer_error.h"
 #include "components/sync/engine_impl/process_updates_util.h"
 #include "components/sync/engine_impl/update_handler.h"
 
 namespace sync_pb {
 class DataTypeProgressMarker;
 class GarbageCollectionDirective;
 class GetUpdatesResponse;
 }
 
 namespace syncer {
 
-namespace sessions {
+class DirectoryTypeDebugInfoEmitter;
+class ModelSafeWorker;
 class StatusController;
-}
 
 namespace syncable {
 class Directory;
 }
 
-class DirectoryTypeDebugInfoEmitter;
-class ModelSafeWorker;
-
 // This class represents the syncable::Directory's processes for requesting and
 // processing updates from the sync server.
 //
 // Each instance of this class represents a particular type in the
 // syncable::Directory.  It can store and retreive that type's progress markers.
 // It can also process a set of received SyncEntities and store their data.
 class DirectoryUpdateHandler : public UpdateHandler {
  public:
   DirectoryUpdateHandler(syncable::Directory* dir,
                          ModelType type,
                          scoped_refptr<ModelSafeWorker> worker,
                          DirectoryTypeDebugInfoEmitter* debug_info_emitter);
   ~DirectoryUpdateHandler() override;
 
   // UpdateHandler implementation.
   bool IsInitialSyncEnded() const override;
   void GetDownloadProgress(
       sync_pb::DataTypeProgressMarker* progress_marker) const override;
   void GetDataTypeContext(sync_pb::DataTypeContext* context) const override;
   SyncerError ProcessGetUpdatesResponse(
       const sync_pb::DataTypeProgressMarker& progress_marker,
       const sync_pb::DataTypeContext& mutated_context,
       const SyncEntityList& applicable_updates,
-      sessions::StatusController* status) override;
-  void ApplyUpdates(sessions::StatusController* status) override;
-  void PassiveApplyUpdates(sessions::StatusController* status) override;
+      StatusController* status) override;
+  void ApplyUpdates(StatusController* status) override;
+  void PassiveApplyUpdates(StatusController* status) override;
 
  private:
   friend class DirectoryUpdateHandlerApplyUpdateTest;
   friend class DirectoryUpdateHandlerProcessUpdateTest;
 
   // Sometimes there is nothing to do, so we can return without doing anything.
   bool IsApplyUpdatesRequired();
 
   // Called at the end of ApplyUpdates and PassiveApplyUpdates and performs
   // steps common to both (even when IsApplyUpdatesRequired has returned
   // false).
   void PostApplyUpdates();
 
   // Processes the given SyncEntities and stores their data in the directory.
   // Their types must match this update handler's type.
   void UpdateSyncEntities(syncable::ModelNeutralWriteTransaction* trans,
                           const SyncEntityList& applicable_updates,
-                          sessions::StatusController* status);
+                          StatusController* status);
 
   // Expires entries according to GC directives.
   void ExpireEntriesIfNeeded(
       syncable::ModelNeutralWriteTransaction* trans,
       const sync_pb::DataTypeProgressMarker& progress_marker);
 
   // Stores the given progress marker in the directory.
   // Its type must match this update handler's type.
   void UpdateProgressMarker(
       const sync_pb::DataTypeProgressMarker& progress_marker);
 
   bool IsValidProgressMarker(
       const sync_pb::DataTypeProgressMarker& progress_marker) const;
 
   // Skips all checks and goes straight to applying the updates.
-  SyncerError ApplyUpdatesImpl(sessions::StatusController* status);
+  SyncerError ApplyUpdatesImpl(StatusController* status);
 
   // Creates root node for the handled model type.
   void CreateTypeRoot(syncable::ModelNeutralWriteTransaction* trans);
 
   syncable::Directory* dir_;
   ModelType type_;
   scoped_refptr<ModelSafeWorker> worker_;
   DirectoryTypeDebugInfoEmitter* debug_info_emitter_;
 
   std::unique_ptr<sync_pb::GarbageCollectionDirective> cached_gc_directive_;
 
   DISALLOW_COPY_AND_ASSIGN(DirectoryUpdateHandler);
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_ENGINE_IMPL_DIRECTORY_UPDATE_HANDLER_H_