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

components/browser_sync/browser/profile_sync_service.h

 // Copyright (c) 2012 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_BROWSER_SYNC_BROWSER_PROFILE_SYNC_SERVICE_H_
 #define COMPONENTS_BROWSER_SYNC_BROWSER_PROFILE_SYNC_SERVICE_H_
 
 #include <memory>
 #include <set>
 #include <string>
@@ skipping 298 matching lines @@
   bool HasObserver(
       const sync_driver::SyncServiceObserver* observer) const override;
   void RegisterDataTypeController(
       sync_driver::DataTypeController* data_type_controller) override;
   void ReenableDatatype(syncer::ModelType type) override;
   SyncTokenStatus GetSyncTokenStatus() const override;
   std::string QuerySyncStatusSummaryString() override;
   bool QueryDetailedSyncStatus(syncer::SyncStatus* result) override;
   base::string16 GetLastSyncedTimeString() const override;
   std::string GetBackendInitializationStateString() const override;
-  syncer::sessions::SyncSessionSnapshot GetLastSessionSnapshot() const override;
+  syncer::SyncCycleSnapshot GetLastCycleSnapshot() const override;
   base::Value* GetTypeStatusMap() const override;
   const GURL& sync_service_url() const override;
   std::string unrecoverable_error_message() const override;
   tracked_objects::Location unrecoverable_error_location() const override;
   void AddProtocolEventObserver(
       browser_sync::ProtocolEventObserver* observer) override;
   void RemoveProtocolEventObserver(
       browser_sync::ProtocolEventObserver* observer) override;
   void AddTypeDebugInfoObserver(
       syncer::TypeDebugInfoObserver* observer) override;
@@ skipping 690 matching lines @@
   base::WeakPtrFactory<ProfileSyncService> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileSyncService);
 };
 
 bool ShouldShowActionOnUI(
     const syncer::SyncProtocolError& error);
 
 
 #endif  // COMPONENTS_BROWSER_SYNC_BROWSER_PROFILE_SYNC_SERVICE_H_