sync: Remove ModelTypeInvalidationMap

sync/internal_api/public/base/model_type_test_util.h

Index: sync/internal_api/public/base/model_type_test_util.h
diff --git a/sync/internal_api/public/base/model_type_test_util.h b/sync/internal_api/public/base/model_type_test_util.h
index cd347cbd7ab8e75ec8be3562159420d66d82ef36..c724bf53687f68df567a3fb6d456a1b48557706f 100644
--- a/sync/internal_api/public/base/model_type_test_util.h
+++ b/sync/internal_api/public/base/model_type_test_util.h
@@ -8,10 +8,19 @@
 #include <ostream>
 
 #include "sync/internal_api/public/base/model_type.h"
+#include "sync/notifier/object_id_invalidation_map.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 namespace syncer {
 
+// Builds an invaliation map that contains a single invalidation with specified
+// type, version, and payload.  The type will be converted from a ModelType to
+// and ObjectId.
+ObjectIdInvalidationMap BuildInvalidationMap(
+    ModelType type,
+    int version,
+    const std::string& payload);
+
 // Defined for googletest.  Forwards to ModelTypeSetToString().
 void PrintTo(ModelTypeSet model_types, ::std::ostream* os);