DevTools: Dont allow editing internal object properties in console.

Internal properties inherently are not writeable, thus they should behave so in the frontend.

R=vsevik

Review URL: https://codereview.chromium.org/323313005

git-svn-id: svn://svn.chromium.org/blink/trunk@176184 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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

@@ -354,7 +354,8 @@ WebInspector.RemoteObjectImpl.prototype = {
                     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);