Problem: Newly added features can escape the sandbox.
Solution: Add checks for restricted and secure. (Yasuhiro Matsumoto)
3849992b16
timer_start is missing check_secure.
The timer callback can, for example, call a function defined from outside the sandbox that does
stuff that would be disallowed from inside the sandbox. This is usually not allowed.
Cherry-pick eval.txt change from:
68e6560b84
Required for v8.1.2013.
38a831e54a