DevTools: remove try catch statement and exceptions from ModuleManager.resolve

It is a bit annoying to stop on all caught exceptions when Devtools are reloading.

BUG=

Review URL: https://codereview.chromium.org/242213003

git-svn-id: svn://svn.chromium.org/blink/trunk@171939 bbb929c8-8fbe-4397-9dbb-9b2b20218538