Fix isInternalProperty when there are no internal properties

Fix isInternalProperty when there are no internal properties

Before my patch isInternalProperty would look like:
....
    switch (id) {

            return true;
        default:
            return false;
    }
...
since we have no internal properties at the moment.
With this patch it is simply:
{
    return false;
}

BUG=396992

[rwlbuis, 2015-01-30 23:41:47]

rob.buis@samsung.com changed reviewers:
+ esprehn@chromium.org, timloh@chromium.org

[rwlbuis, 2015-01-30 23:41:48]

PTAL

[Timothy Loh, 2015-02-01 22:50:17]

timloh@chromium.org changed reviewers:
+ jchaffraix@chromium.org

[Timothy Loh, 2015-02-01 22:50:18]

Do we still need this concept at all? I think I talked with Julien about it a
while ago but I don't remember if we decided on anything.

[rwlbuis, 2015-02-02 01:57:35]

On 2015/02/01 22:50:18, Timothy Loh wrote:
> Do we still need this concept at all? I think I talked with Julien about it a
> while ago but I don't remember if we decided on anything.

That would be fine by me. I prepared https://codereview.chromium.org/879443006/
in case we want to do that.