Use prototypes/constructors from the inspected page when operating on objects from the inspected page

        Reviewed by Tim Hatcher.

        * page/inspector/Console.js:
        (WebInspector.ConsolePanel._format): Use the Node constructor from the
        inspected Window with the instanceof operator.
        * page/inspector/ElementsPanel.js:
        (WebInspector.DOMNodeTreeElement._attributeEditingCommitted): Use the
        Element prototype from the inspected Window instead of the Element
        prototype from this Window.
        * page/inspector/inspector.js:
        (WebInspector.performSearch): Ditto for Document prototype.
        * page/inspector/utilities.js:
        (Object.type): Now takes an optional Window parameter that is used to
        find the built-in constructors.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@31889 268f45cc-cd09-0410-ab3c-d52691b4dbfc