lint - remove no longer needed imports

src/components/fx/helpers.js

@@ -9,7 +9,6 @@
 'use strict';
 
 var Lib = require('../../lib');
-var constants = require('./constants');
 
 // look for either subplot or xaxis and yaxis attributes
 exports.getSubplot = function getSubplot(trace) {

src/traces/scattergl/index.js

@@ -14,7 +14,6 @@ var ErrorBars = require('../../components/errorbars');
 var extend = require('object-assign');
 var Axes = require('../../plots/cartesian/axes');
 var kdtree = require('kdgrass');
-var Fx = require('../../components/fx');
 var subTypes = require('../scatter/subtypes');
 var calcColorscales = require('../scatter/colorscale_calc');
 var Drawing = require('../../components/drawing');