browser REPL should provide cljs.user

Author: swannodette

src/main/cljs/clojure/browser/repl.cljs

@@ -119,6 +119,8 @@
     (set! (.-require__ js/goog) js/goog.require)
     ;; suppress useless Google Closure error about duplicate provides
     (set! (.-isProvided_ js/goog) (fn [name] false))
+    ;; provide cljs.user
+    (goog/provide "cljs.user")
     (set! (.-writeScriptTag__ js/goog)
       (fn [src opt_sourceText]
         ;; the page is already loaded, we can no longer leverage document.write