forEach -> for

Author: alexcjohnson

src/plot_api/plot_api.js

@@ -400,15 +400,19 @@ function setPlotContext(gd, config) {
     if(!gd._context) gd._context = Lib.extendFlat({}, Plotly.defaultConfig);
     var context = gd._context;
 
+    var i, keys, key;
+
     if(config) {
-        Object.keys(config).forEach(function(key) {
+        keys = Object.keys(config);
+        for(i = 0; i < keys.length; i++) {
+            key = keys[i];
             if(key in context) {
                 if(key === 'setBackground' && config[key] === 'opaque') {
                     context[key] = opaqueSetBackground;
                 }
                 else context[key] = config[key];
             }
-        });
+        }
 
         // map plot3dPixelRatio to plotGlPixelRatio for backward compatibility
         if(config.plot3dPixelRatio && !context.plotGlPixelRatio) {