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

components/sync/engine_impl/directory_update_handler.h

Index: components/sync/engine_impl/directory_update_handler.h
diff --git a/components/sync/engine_impl/directory_update_handler.h b/components/sync/engine_impl/directory_update_handler.h
index 67496536b34aaaadc8ef4dcc43a99f71da580eda..620ee7f5e87b4e70626380428a724971f9c4c3af 100644
--- a/components/sync/engine_impl/directory_update_handler.h
+++ b/components/sync/engine_impl/directory_update_handler.h
@@ -23,17 +23,14 @@ 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.
 //
@@ -57,9 +54,9 @@ class DirectoryUpdateHandler : public UpdateHandler {
       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;
@@ -77,7 +74,7 @@ class DirectoryUpdateHandler : public UpdateHandler {
   // 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(
@@ -93,7 +90,7 @@ class DirectoryUpdateHandler : public UpdateHandler {
       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);