Consolidate getActiveBreakpoint()

[photodow]

The getActiveBreakpoint utility is very similar to activeBreakpoint within /Specs/Grid. Is there enough overlap that these can be combined? I believe the use cases for them are slightly different, but it's worth looking into.

devtools/App/inject/components/Specs/Grid/index.js

Lines 122 to 144 in 908aa3e

	function activeBreakpoint (classList) {
	// TODO: Can this be combined with getActiveBreakpoint class?
	const breakpointKeys = Object.keys(breakpoints);
	const l = breakpointKeys.length;
	const windowWidth = rem(window.innerWidth);
	let breakpointName, breakpoint, active;
	for (let i = 0; i < l; i++) {
	breakpointName = breakpointKeys[i];
	// if class list contains this breakpoint
	if (classList.indexOf(breakpointName) > -1) {
	breakpoint = breakpoints[breakpointName];
	// AND breakpoint width is less than window width
	if (parseInt(breakpoint.width, 10) <= parseInt(windowWidth, 10)) {
	active = breakpointName;
	} else {
	break;
	}
	}
	}
	return active;
	}

https://github.com/carbon-design-system/devtools/blob/master/App/utilities/getActiveBreakpoint.js