refactor emitMemberName to be used more consistently

lib/runtime/dart_runtime.js

Index: lib/runtime/dart_runtime.js
diff --git a/lib/runtime/dart_runtime.js b/lib/runtime/dart_runtime.js
index 680c3b7402be2b7b55de599b0d380904604659b6..98ed2297dc9e57b76be1e86ed400da1b2a2ecf95 100644
--- a/lib/runtime/dart_runtime.js
+++ b/lib/runtime/dart_runtime.js
@@ -78,7 +78,7 @@ var dart, _js_helper;
     let args = Array.prototype.slice.call(arguments, 2);
     return checkAndCall(obj[method], obj, args, method);
   }
-  dart.dinvoke = dsend;
+  dart.dsend = dsend;
 
   function dindex(obj, index) {
     return checkAndCall(obj.get, obj, [index], '[]');
@@ -88,7 +88,7 @@ var dart, _js_helper;
   function dsetindex(obj, index, value) {
     return checkAndCall(obj.set, obj, [index, value], '[]=');
   }
-  dart.dsetindex = dindex;
+  dart.dsetindex = dsetindex;
 
   function cast(obj, type) {
     // TODO(vsm): handle non-nullable types