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Update loading chrome://print/a/b/ to work in debug builds instead of
resulting in errors by adding <base href="chrome://print">. Also
automatically correct URLs like this to chrome://print, to match
the behavior of the settings and extensions pages.

Bug: none
Change-Id: I466558eff395ac8ac726e3ba7f5e8e7788c6f796
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1592048
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#656208}