[DevTools] Simplify evaluation callbacks on frontend

third_party/WebKit/Source/devtools/front_end/sdk/RemoteObject.js

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 375 matching lines @@
 
     this._type = type;
     this._subtype = subtype;
     if (objectId) {
         // handle
         this._objectId = objectId;
         this._description = description;
         this._hasChildren = (type !== "symbol");
         this._preview = preview;
     } else {
-        // Primitive or null object.
-        this._description = description || (value + "");
+        this._description = description;
+        if (!this._description && (typeof value !== "object" || value === null))
+            this._description = value + "";
         this._hasChildren = false;
         if (typeof unserializableValue !== "undefined") {
             this._unserializableValue = unserializableValue;
             if (unserializableValue === RuntimeAgent.UnserializableValue.Infinity ||
                 unserializableValue === RuntimeAgent.UnserializableValue.NegativeInfinity ||
                 unserializableValue === RuntimeAgent.UnserializableValue.Negative0 ||
                 unserializableValue === RuntimeAgent.UnserializableValue.NaN) {
                 this.value = Number(unserializableValue);
             } else {
                 this.value = unserializableValue;
@@ skipping 1102 matching lines @@
     },
 
     /**
      * @return {!WebInspector.RemoteObject}
      */
     object: function()
     {
         return this._object;
     }
 }