Make auto-complete only suggest properties that are valid syntax

    Make auto-complete only suggest properties that are valid syntax
        when using dot-notation. Also when completing numeric properties,
        the quotes are omitted inside the brackets.

        https://bugs.webkit.org/show_bug.cgi?id=21760
        https://bugs.webkit.org/show_bug.cgi?id=21761

        Reviewed by Oliver Hunt.

        * inspector/front-end/Console.js:
        (WebInspector.Console.prototype.completions): Skip properties that
        are not valid identifies when using dot-notation. And omit the quotes
        when completing numbers in bracket-notation.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@37757 268f45cc-cd09-0410-ab3c-d52691b4dbfc