Use stricter type checking in UMA_HISTOGRAM_ENUMERATION

components/sync/model/data_type_error_handler_impl.cc

Index: components/sync/model/data_type_error_handler_impl.cc
diff --git a/components/sync/model/data_type_error_handler_impl.cc b/components/sync/model/data_type_error_handler_impl.cc
index 894fdffe78bdecd62d91e3b759bb07f8c5d2896b..ca526e2d4212a5e9e49b6679eaef2c51cbf81ca2 100644
--- a/components/sync/model/data_type_error_handler_impl.cc
+++ b/components/sync/model/data_type_error_handler_impl.cc
@@ -22,9 +22,10 @@ DataTypeErrorHandlerImpl::~DataTypeErrorHandlerImpl() {}
 void DataTypeErrorHandlerImpl::OnUnrecoverableError(const SyncError& error) {
   if (!dump_stack_.is_null())
     dump_stack_.Run();
+  // TODO(wychen): enum uma should be strongly typed. crbug.com/661401
   UMA_HISTOGRAM_ENUMERATION("Sync.DataTypeRunFailures",
                             ModelTypeToHistogramInt(error.model_type()),
-                            MODEL_TYPE_COUNT);
+                            static_cast<int>(MODEL_TYPE_COUNT));
   ui_thread_->PostTask(error.location(), base::Bind(sync_callback_, error));
 }