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

components/sync/driver/sync_service.h

Index: components/sync/driver/sync_service.h
diff --git a/components/sync/driver/sync_service.h b/components/sync/driver/sync_service.h
index 96637b619978a9c87dad568ea9788fae50cd2511..e74fedbf2ca458e312e8b07490ce2d3257d74c49 100644
--- a/components/sync/driver/sync_service.h
+++ b/components/sync/driver/sync_service.h
@@ -29,14 +29,11 @@ namespace syncer {
 
 class BaseTransaction;
 class JsController;
+class SyncCycleSnapshot;
 class TypeDebugInfoObserver;
 struct SyncStatus;
 struct UserShare;
 
-namespace sessions {
-class SyncSessionSnapshot;
-}  // namespace sessions
-
 }  // namespace syncer
 
 namespace sync_driver {
@@ -295,8 +292,7 @@ class SyncService : public DataTypeEncryptionHandler {
   // Returns a human readable string describing backend initialization state.
   virtual std::string GetBackendInitializationStateString() const = 0;
 
-  virtual syncer::sessions::SyncSessionSnapshot GetLastSessionSnapshot()
-      const = 0;
+  virtual syncer::SyncCycleSnapshot GetLastCycleSnapshot() const = 0;
 
   // Returns a ListValue indicating the status of all registered types.
   //