Remove the infamous RELEASE_ASSERT_WITH_SECURITY_IMPLICATION

The security implication doesn't matter that much for us at this point
(tech preview material, not production quality). But having the render
process apparently crashing does not look good.

Change-Id: I72d494cfa8b7d5babb30572cedd6520f3dc44d16
Reviewed-by: Zeno Albisser <zeno.albisser@digia.com>