Change SVG selection in chartHeightCb
Change SVG selection in chartHeightCb

'chartHeightCb 'used to select all SVGs, which include chart icon SVGs,
chart-customizer and all. This made the function tamper with dimensions
of these unwanted shapes. Fixed it by selecting the SVG by unique CSS
class name- chartSvgClass

arunsoman/polymer-d3,arunsoman/polymer-d3