kernel: Optimizing.

Do not perform delete when not needed.
Load time shortened.

lang/base/kernel-runtime.js

@@ -10,7 +10,7 @@ define(['./junk-drawer'], function ($goodies) {
     var deleteKeysFrom = $goodies.deleteKeysFrom;
     var extendWithMethods = $goodies.extendWithMethods;
 
-    function uninstallMethodOfJsObjectEx (obj, name) {
+    function cleanMethodOfJsObjectEx (obj, name) {
         var attachments;
         var old = Object.getOwnPropertyDescriptor(obj, name);
         if (old != null && (old = old.value) != null) {
@@ -19,11 +19,10 @@ define(['./junk-drawer'], function ($goodies) {
                 deleteKeysFrom(Object.keys(attachments), obj);
             }
         }
-        delete obj[name];
     }
 
     function installMethodOfJsObjectEx (obj, name, fn) {
-        uninstallMethodOfJsObjectEx(obj, name);
+        cleanMethodOfJsObjectEx(obj, name);
         var attachments = fn.a$atx;
         if (attachments != null) {
             extendWithMethods(obj, attachments);
@@ -258,7 +257,8 @@ define(['./junk-drawer'], function ($goodies) {
             };
 
             emit.behaviorMethodRemoved = function (method, klass) {
-                uninstallMethodOfJsObjectEx(klass.fn.prototype, method.jsSelector);
+                cleanMethodOfJsObjectEx(klass.fn.prototype, method.jsSelector);
+                delete klass.fn.prototype[method.jsSelector];
                 propagateMethodChange(klass, method, null);
             };