[Code Health] Retire kStandardCompliantNonSpecialSchemeURLParsing

This CL removes all traces of the
kStandardCompliantNonSpecialSchemeURLParsing flag since all usages have
been previously removed, including virtual test suites created for that
flag.

Bug: 388143055
Change-Id: I3c2144e46083366cf303631f70850f54834a3059
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6616547
Reviewed-by: Marijn Kruisselbrink <mek@chromium.org>
Commit-Queue: Dibyajyoti Pal <dibyapal@chromium.org>
Reviewed-by: Weizhong Xia <weizhong@google.com>
Reviewed-by: Hayato Ito <hayato@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1469264}