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This reverts part of 5abacc3b and restores the query param
'debugFrontend', which makes the frontend load resources
locally rather from remote URL.

R=caseq@chromium.org, paulirish@chromium.org, tvanderlippe@chromium.org

Fixed: chromium:1098505
Change-Id: I61330d4f679fb280245e98122ac23d0031e89e11
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2263733
Commit-Queue: Yang Guo <yangguo@chromium.org>
Reviewed-by: Paul Irish <paulirish@chromium.org>
Reviewed-by: Tim van der Lippe <tvanderlippe@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#782139}