WIP: HACK: make angular recognize ES6 constructor as a function.

This doesn't currently work right since Angular illegally calls
the constructor via apply() without "new". Known Angular issue:

angular/angular.js#12597

Author: klausw

client/components/container/container-service.js

@@ -253,4 +253,10 @@ explorer.components.container.ContainerService = class {
 };
 const ContainerService = explorer.components.container.ContainerService;
 
+ContainerService.__stringVal = ContainerService.toString();
+
+ContainerService.toString = function() {
+  return ContainerService.__stringVal.replace(/class\s*{\s*constructor/, 'function');
+};
+
 });  // goog.scope