Get rid of error-prone ReleaseParsedCalcValueCondition argument in CSSParser
https://bugs.webkit.org/show_bug.cgi?id=139334

Reviewed by Darin Adler.

Get rid of error-prone ReleaseParsedCalcValueCondition argument in
CSSParser that determines the the m_parsedCalculation member should
be released.

Instead, introduce a new ValueWithCalculation type which wraps a
CSSParserValue and an optional parsed calculation value. This way,
the parsed calculation value is now associated with its CSSParserValue.
This makes it very difficult to use a parsed calculation value for the
wrong CSSParserValue. The API is also easier to use as developers no
longer need to explicitly indicate if the calculation value should be
released or not.

No new tests, no web-behavior change.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@177623 268f45cc-cd09-0410-ab3c-d52691b4dbfc