Before:
{
    "magic" : "FOO",
    "entries" : [
        {
            "payload" : {
                "foo" : "bar",
                "bar" : "foo"
            },
            "extra" : "abc"
        },
        {
            "payload" : {
            "foo" : "bar",
            "bar" : "foo"
            },
            "extra" : "abc"
        }
    ]
}

After:
{
    "magic" : "FOO",
    "entries" : [
        {
            "foo" : "bar",
            "bar" : "foo"
            "extra" : "abc"
        },
        {
            "foo" : "bar",
            "bar" : "foo"
            "extra" : "abc"
        }
    ]
}

We don't have any fields named "extra" in our pb msgs and it is
not likely that we will ever have one, so there is no reason to
worry about that.
Signed-off-by: Ruslan Kuprieiev <kupruser@gmail.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>