DevTools: prepare frontend for fileURLs in Node backend
DevTools: prepare frontend for fileURLs in Node backend

Starting next Node 10.x and Node 11 release, Node will report fileURL
instead of platform path for all parsed scripts.

R=0ca14b32cbb359a30ac562af27dd84cc2813eacb@chromium.org

Bug: none
Change-Id: Ic9ca40a2369a0b4529be7822a7e55a08a7378200
Reviewed-on: https://chromium-review.googlesource.com/1229073
Reviewed-by: Dmitry Gozman <0ca14b32cbb359a30ac562af27dd84cc2813eacb@chromium.org>
Commit-Queue: Aleksey Kozyatinskiy <562acbea96970f508ad9f5cc9fc7c62d82dd3ef8@chromium.org>
Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#592297}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 0985224d28c92ee0543479a1ac7cc5d362e782a3
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