DevTools: Dont allow editing internal object properties in console.

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 336 matching lines @@
 
                 result.push(remoteProperty);
             }
             var internalPropertiesResult = null;
             if (internalProperties) {
                 internalPropertiesResult = [];
                 for (var i = 0; i < internalProperties.length; i++) {
                     var property = internalProperties[i];
                     if (!property.value)
                         continue;
-                    internalPropertiesResult.push(new WebInspector.RemoteObjectProperty(property.name, this._target.runtimeModel.createRemoteObject(property.value)));
+                    var propertyValue = this._target.runtimeModel.createRemoteObject(property.value);
+                    internalPropertiesResult.push(new WebInspector.RemoteObjectProperty(property.name, propertyValue, true, false));
                 }
             }
             callback(result, internalPropertiesResult);
         }
         this._runtimeAgent.getProperties(this._objectId, ownProperties, accessorPropertiesOnly, remoteObjectBinder.bind(this));
     },
 
     /**
      * @param {string} name
      * @param {string} value
@@ skipping 598 matching lines @@
             result = functionDeclaration.apply(target, rawArgs);
         } catch (e) {
             result = null;
         }
 
         callback(result);
     },
 
     __proto__: WebInspector.RemoteObject.prototype
 }