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Always add the <base href="chrome://extensions> tag, even in optimized
builds, since it no longer needs to be added by the optimize_webui
script. This is because Polymer 3 pages use rollup rather than
Polymer bundler. Rollup does not process HTML files and therefore
does not have the same issue with eating <base> tags that Polymer
bundler did.

The base tag is needed for URLs like chrome://extensions/a/b/ to
work correctly and not cause a console error.

Bug: 1004967
Change-Id: I9b8b6c20ebe8de1a6a5c92361079321b124fa6c5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1918644Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715568}