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When available, use internal version of main.html and resources file.

Bug: 957205
Change-Id: I3d7c7f381bf42e51685d553f90fe0d4c994fc1ce
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1590646Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Ben Wells <benwells@chromium.org>
Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Commit-Queue: Bruno Santos <brunoad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#656355}