Hook up Autofill Backend interface to SyncableServices

components/webdata/common/web_database.h

Index: components/webdata/common/web_database.h
diff --git a/components/webdata/common/web_database.h b/components/webdata/common/web_database.h
index 62aff94b706ac0be469f5136e949201d7c17032c..e14f179a3573e45bed94b1414ab0bf364036c4f5 100644
--- a/components/webdata/common/web_database.h
+++ b/components/webdata/common/web_database.h
@@ -8,6 +8,7 @@
 #include <map>
 
 #include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
 #include "components/webdata/common/web_database_table.h"
 #include "components/webdata/common/webdata_export.h"
 #include "sql/connection.h"
@@ -58,6 +59,12 @@ class WEBDATA_EXPORT WebDatabase {
   // Exposed for testing only.
   sql::Connection* GetSQLConnection();
 
+  base::WeakPtr<WebDatabase> AsWeakPtr();
+
+ protected:
+  // All vended weak pointers are invalidated in dtor.
+  base::WeakPtrFactory<WebDatabase> weak_ptr_factory_;
+
  private:
   // Used by |Init()| to migration database schema from older versions to
   // current version.