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To avoid targeting many versions of Bison, we will now require editors
of xpath_grammar.y to manually regenerate the generated files. See
xpath_grammar.y for instructions on running Bison.

Since we're only targeting new versions of Bison, we can now replace
the %pure-parser directive with the equivalent %define. As a result,
we no longer need to silence the warning about %pure-parser.

Also removing //third_party/bison from DEPS, which contains a snapshot
of a Windows fork of Bison 2.4.1 (from 2012).

Bug: 1028421
Change-Id: I8deb986f0cafb8e7f093c5def71d427709a4a845
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1954609Reviewed-by: Chris Palmer <palmer@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Dan McArdle <dmcardle@chromium.org>
Cr-Commit-Position: refs/heads/master@{#722623}