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

chrome/browser/sync/glue/extension_data_type_controller.h

Index: chrome/browser/sync/glue/extension_data_type_controller.h
diff --git a/chrome/browser/sync/glue/extension_data_type_controller.h b/chrome/browser/sync/glue/extension_data_type_controller.h
index 761db0875203321f309faaf2cdb62f34217559e3..4ebe3cfd83d63becde82c0f1c86aaa160a94275b 100644
--- a/chrome/browser/sync/glue/extension_data_type_controller.h
+++ b/chrome/browser/sync/glue/extension_data_type_controller.h
@@ -12,6 +12,8 @@
 
 namespace browser_sync {
 
+class GenericChangeProcessor;
+
 class ExtensionDataTypeController : public FrontendDataTypeController {
  public:
   ExtensionDataTypeController(
@@ -23,6 +25,9 @@ class ExtensionDataTypeController : public FrontendDataTypeController {
   // DataTypeController implementation.
   virtual syncable::ModelType type() const;
 
+ protected:
+  virtual ChangeProcessor* change_processor() const OVERRIDE;
+
  private:
   // DataTypeController implementations.
   virtual bool StartModels();
@@ -33,6 +38,8 @@ class ExtensionDataTypeController : public FrontendDataTypeController {
   virtual void RecordAssociationTime(base::TimeDelta time);
   virtual void RecordStartFailure(StartResult result);
 
+  scoped_ptr<GenericChangeProcessor> change_processor_;
+
   DISALLOW_COPY_AND_ASSIGN(ExtensionDataTypeController);
 };