[Sync] Refactor non-frontend DTC to handle new API properly.

chrome/browser/sync/glue/preference_data_type_controller.h

Index: chrome/browser/sync/glue/preference_data_type_controller.h
diff --git a/chrome/browser/sync/glue/preference_data_type_controller.h b/chrome/browser/sync/glue/preference_data_type_controller.h
index 6f3d009ab685e69c1f25a2923d4dfc9dcfcffac9..e6b3c3adcbc72e3ca7de82c5a06814cbbc9dca22 100644
--- a/chrome/browser/sync/glue/preference_data_type_controller.h
+++ b/chrome/browser/sync/glue/preference_data_type_controller.h
@@ -13,6 +13,8 @@
 
 namespace browser_sync {
 
+class GenericChangeProcessor;
+
 class PreferenceDataTypeController : public FrontendDataTypeController {
  public:
   PreferenceDataTypeController(
@@ -24,6 +26,9 @@ class PreferenceDataTypeController : public FrontendDataTypeController {
   // FrontendDataTypeController implementation.
   virtual syncable::ModelType type() const OVERRIDE;
 
+ protected:
+  virtual ChangeProcessor* change_processor() const OVERRIDE;
+
  private:
   // FrontendDataTypeController implementations.
   virtual void CreateSyncComponents() OVERRIDE;
@@ -33,6 +38,8 @@ class PreferenceDataTypeController : public FrontendDataTypeController {
   virtual void RecordAssociationTime(base::TimeDelta time) OVERRIDE;
   virtual void RecordStartFailure(StartResult result) OVERRIDE;
 
+  scoped_ptr<GenericChangeProcessor> change_processor_;
+
   DISALLOW_COPY_AND_ASSIGN(PreferenceDataTypeController);
 };