browser: use typeof to check for console existence

It's a global, so we must check with typeof otherwise
an error will be thrown if `console` is undefined.

browser.js

@@ -112,9 +112,9 @@ function formatArgs() {
  */
 
 function log() {
-  // This hackery is required for IE8,
-  // where the `console.log` function doesn't have 'apply'
-  return console
+  // this hackery is required for IE8/9, where
+  // the `console.log` function doesn't have 'apply'
+  return 'object' === typeof console
     && console.log
     && Function.prototype.apply.call(console.log, console, arguments);
 }