Fix memory leak by css_parser_proto_fuzzer

crrev.com/636467 removed nine keywords from kValueLookupTable[] in
css_proto_converter.cc, and it caused mismatches with css.proto.  This CL
reverts kValueLookupTable[].

Bug: 940295
Change-Id: I59b838eb4827f870b417d6d1144b99ac116fe7fe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1514288
Reviewed-by: Jonathan Metzman <metzman@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#639727}
1 file changed