Implement new SyncAPI and convert Preferences to it.

chrome/browser/sync/glue/syncable_service_adapter.h

Index: chrome/browser/sync/glue/syncable_service_adapter.h
diff --git a/chrome/browser/sync/glue/syncable_service_adapter.h b/chrome/browser/sync/glue/syncable_service_adapter.h
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+// Copyright (c) 2011 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 CHROME_BROWSER_SYNC_GLUE_SYNCABLE_SERVICE_ADAPTER_H_
+#define CHROME_BROWSER_SYNC_GLUE_SYNCABLE_SERVICE_ADAPTER_H_
+#pragma once
+
+#include <vector>
+
+#include "base/compiler_specific.h"
+#include "chrome/browser/sync/api/syncable_service.h"
+#include "chrome/browser/sync/glue/model_associator.h"
+
+class SyncableService;
+
+namespace browser_sync {
+
+class GenericChangeProcessor;
+
+// An adapter to handle transitioning from model associator's to syncable
+// services. Implements the model associator interface, invoking the
+// provided SyncableService as necessary.
+class SyncableServiceAdapter : public AssociatorInterface {
+ public:
+  explicit SyncableServiceAdapter(syncable::ModelType type,
+                                  SyncableService* service,
+                                  GenericChangeProcessor* sync_processor);
+  virtual ~SyncableServiceAdapter();
+
+  // AssociatorInterface implementation.
+  virtual bool AssociateModels() OVERRIDE;
+  virtual bool DisassociateModels() OVERRIDE;
+  virtual bool SyncModelHasUserCreatedNodes(bool* has_nodes) OVERRIDE;
+  virtual void AbortAssociation() OVERRIDE;
+  virtual bool CryptoReadyIfNecessary() OVERRIDE;
+
+ private:
+  // Whether the SyncableService we wrap is currently syncing or not.
+  bool syncing_;
+
+  // The data type being provided by this service.
+  syncable::ModelType type_;
+
+  // A pointer to the actual local syncable service, which performs all the
+  // real work.
+  SyncableService* service_;
+
+  // The datatype's SyncChange handler that interacts with the sync db.
+  GenericChangeProcessor* sync_processor_;
+
+  DISALLOW_COPY_AND_ASSIGN(SyncableServiceAdapter);
+};
+
+}  // namespace browser_sync
+
+#endif  // CHROME_BROWSER_SYNC_GLUE_SYNCABLE_SERVICE_ADAPTER_H_