Improve multi-glyph stretchy characters in Chrome. (mathjax/MathJax#2311) #452
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MathJax CHTML output uses a scaling transform to stretch the extenders in multi-character stretchy delimiters. Chrome (and Firefox) don't align these with unstretched ending characters as well as they should. Adding a scale transform (with an insignificant scaling factor) improves the results in these browsers. The factor must be other than 1 in Chrome to make a difference.
Resolves issue mathjax/MathJax#2311.