http://crbug.com/438064 has been fixed

Refs #14972

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Merge pull request #15424 from twbs/chrome-438064-fixed

Remove #14972's entry from Wall of Browser bugs
Remove reference to old fixed WebKit bug in Less comment.

Per https://github.com/twbs/bootstrap/issues/1969#issuecomment-36971094

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Merge pull request #15427 from twbs/defunct-bug-1969

Remove reference to old fixed WebKit bug in Less comment.
Reference iOS Safari temporal input bug in explanatory Less comment

Refs #11266, #13098, #15415

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automatic grunt dist