Hook up Autofill Backend interface to SyncableServices

components/autofill/browser/webdata/autofill_webdata_service.h

Index: components/autofill/browser/webdata/autofill_webdata_service.h
diff --git a/components/autofill/browser/webdata/autofill_webdata_service.h b/components/autofill/browser/webdata/autofill_webdata_service.h
index fd5c6cea20c6f5622a6860078de95e703a21145c..ae76613f69b02d07e66a5dacc87d7eda90f524cf 100644
--- a/components/autofill/browser/webdata/autofill_webdata_service.h
+++ b/components/autofill/browser/webdata/autofill_webdata_service.h
@@ -31,11 +31,14 @@ class AutofillWebDataBackend;
 class AutofillWebDataServiceObserverOnDBThread;
 class AutofillWebDataServiceObserverOnUIThread;
 class CreditCard;
+class AutofillBackendDelegate;
 
 // API for Autofill web data.
 class AutofillWebDataService : public AutofillWebData,
                                public WebDataServiceBase {
  public:
+  typedef base::Callback<void(AutofillBackendDelegate*)> DelegateOnDBCallback;
+
   AutofillWebDataService();
 
   AutofillWebDataService(scoped_refptr<WebDatabaseService> wdbs,
@@ -46,14 +49,6 @@ class AutofillWebDataService : public AutofillWebData,
   static scoped_refptr<AutofillWebDataService> FromBrowserContext(
       content::BrowserContext* context);
 
-  // Notifies listeners on the UI thread that multiple changes have been made to
-  // to Autofill records of the database.
-  // NOTE: This method is intended to be called from the DB thread.  It
-  // it asynchronously notifies listeners on the UI thread.
-  // |web_data_service| may be NULL for testing purposes.
-  static void NotifyOfMultipleAutofillChanges(
-      AutofillWebDataService* web_data_service);
-
   // WebDataServiceBase implementation.
   virtual void ShutdownOnUIThread() OVERRIDE;
 
@@ -84,9 +79,6 @@ class AutofillWebDataService : public AutofillWebData,
   virtual void RemoveAutofillDataModifiedBetween(
       const base::Time& delete_begin, const base::Time& delete_end) OVERRIDE;
 
-  void AddObserver(AutofillWebDataServiceObserverOnDBThread* observer);
-  void RemoveObserver(AutofillWebDataServiceObserverOnDBThread* observer);
-
   void AddObserver(AutofillWebDataServiceObserverOnUIThread* observer);
   void RemoveObserver(AutofillWebDataServiceObserverOnUIThread* observer);
 
@@ -100,6 +92,13 @@ class AutofillWebDataService : public AutofillWebData,
 
   virtual void ShutdownOnDBThread();
 
+  // Asynchronously gets an instance of |AutofillBackendDelegate|, which can be
+  // used to do work on the DB thread. This method is meant to be called from
+  // the UI thread, but the callback will be called on the DB thread.
+  // The delegate instance is owned by |AutofillWebDataBackend|, and so has the
+  // same lifetime as |AutofillWebDataService|.
+  void GetDelegateOnDB(const DelegateOnDBCallback& del_callback);
+
  protected:
   virtual ~AutofillWebDataService();