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With this CL, HTML imports inovlving chrome-extension:// URLs are
correctly translated to JS imports. For example

chrome-extension://path/to/folder/foo.html becomes
chrome-extension://path/to/folder/foo.m.js

This is necessary to unblock CrOS FileManager migration to JS
modules.

Fixed: 1145876
Change-Id: Ie2e02b6925108db280f626be9c1ad0c261ffd797
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2526501
Commit-Queue: dpapad <dpapad@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825755}