Fix parsing of messages that themselves contain commas.
Fix parsing of messages that themselves contain commas.

I was using javascript's split(",", 3) thinking the extra split points would fall into the third bucket, but instead that way it works is to drop everything after the third bucket.

Review URL: http://codereview.chromium.org/267128

git-svn-id: fcf5dad22b2b9f051ac9862410c0bc750906fb3b@29210 0039d316-1c4b-4281-b951-d872f2087c98

nicko96/Chrome-Infra,nicko96/Chrome-Infra,nicko96/Chrome-Infra,nicko96/Chrome-Infra,nicko96/Chrome-Infra