use process.browser only, which is sufficient

lib/random.js

@@ -3,7 +3,7 @@ function Random() {
 
 /* secure random bytes that sometimes throws an error due to lack of entropy */
 Random.getRandomBuffer = function(size) {
-  if (typeof process === 'undefined' || process.browser)
+  if (process.browser)
     return Random.getRandomBufferBrowser(size);
   else
     return Random.getRandomBufferNode(size);