Move handling of commas up into parseFontFaceSrc
Move handling of commas up into parseFontFaceSrc

This patch moves handling of commas from parseFontFaceSrcLocal and
parseFontFaceSrcURI into the caller parseFontFaceSrc. This also
means that we'll reject a token stream with a trailing comma (currently
the Bison parser will reject these, but the css-syntax parser doesn't),
and so fixes font-face-src-parsing.html under the new parser.

BUG=404023

Review URL: https://codereview.chromium.org/877303002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@189104 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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