remove override style utility

app/lib/utils/override-style.js

@@ -1,31 +0,0 @@
-// hack to configure important style attributes
-// to work around this madness:
-// https://github.com/Khan/aphrodite/pull/41
-
-export default function overrideStyle (obj) {
-  if (obj) {
-    return function (ref) {
-      if (ref) {
-        for (const key in obj) {
-          if (null != obj[key]) {
-            const val = 'number' === typeof obj[key]
-              ? `${obj[key]}px`
-              : String(obj[key]);
-            const prop = toProp(key);
-            ref.style.setProperty(prop, val, 'important');
-          }
-        }
-      }
-    };
-  } else {
-    return null;
-  }
-}
-
-// converts camelCase to camel-case
-function toProp (key) {
-  return key.replace(
-    /[a-z]([A-Z])/,
-    (a, b) => a.substr(0, a.length - 1) + '-' + b.toLowerCase()
-  );
-}