DevTools: prefix node.js scripts's sourceURL with "file://" to make them a valid url
As of today, Node.js scripts are reported with a file path
as their sourceURL.
File path by itself is not a correct URL. This patch prepends
file:// to the path to make it a proper url.
BUG=none
Committed:
https://crrev.com/852dea567434d8a7a9f4bcbfa7fff00c74bac471
Cr-Commit-Position: refs/heads/master@{#426261}