Fix multiscript tests. Code merged for 45 was accidentally crashing the render process when V8 threw an exception instead of just throwing an exception.

BUG=

Review URL: https://codereview.chromium.org/1677783002 .

git-svn-id: https://src.chromium.org/blink/branches/dart/2454_1@202772 bbb929c8-8fbe-4397-9dbb-9b2b20218538
1 file changed