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The base tag was only added in non-optimized builds since Polymer
bundler ate base tags and the optimize_webui script manually restored
them during building. This is no longer needed now that Print Preview
has been migrated to use rollup for bundling.

Bug: None
Change-Id: I422dcc4ce56cd4ce853eec4915951776e88dc679
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2451508Reviewed-by: dpapad <dpapad@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814672}