housekeeping: remove extraneous `getbase` aliases (#4671)

* remove extraneous Babel alias

* remove extraneous Webpack alias

.babelrc

@@ -41,10 +41,6 @@
         {
           "expose": "less",
           "src": "src/less"
-        },
-        {
-          "expose": "base",
-          "src": "npm:getbase/src/less/base"
         }
       ]
     ]

make-webpack-config.js

@@ -141,9 +141,7 @@ module.exports = function(rules, options) {
         "node_modules"
       ],
       extensions: [".web.js", ".js", ".jsx", ".json", ".less"],
-      alias: {
-        base: "getbase/src/less/base",
-      }
+      alias: {}
     },
 
   devtool: specialOptions.sourcemaps ? "nosource-source-map" : false,