Convert all CoffeeScript to Javascript. See:

http://meta.discourse.org/t/is-it-better-for-discourse-to-use-javascript-or-coffeescript/3153

app/assets/javascripts/discourse/controllers/user_controller.js

@@ -0,0 +1,12 @@
+(function() {
+
+  Discourse.UserController = Ember.ObjectController.extend({
+    viewingSelf: (function() {
+      return this.get('content.username') === Discourse.get('currentUser.username');
+    }).property('content.username', 'Discourse.currentUser.username'),
+    canSeePrivateMessages: (function() {
+      return this.get('viewingSelf') || Discourse.get('currentUser.admin');
+    }).property('viewingSelf', 'Discourse.currentUser')
+  });
+
+}).call(this);