Simplify FFI shims

Author: natefaubion

js/frame.js

@@ -1,5 +1,5 @@
 (function() {
-  function evalPureScript(sources) {
+  function evalSources(sources) {
     var modules = {};
     function dirname(str) {
       var ix = str.lastIndexOf("/");
@@ -27,28 +27,13 @@
     };
   }
 
-  function loadScripts(scripts, cb) {
-    if (scripts.length === 0) {
-      return cb();
-    }
-    var script = document.createElement("script");
-    script.type = "text/javascript";
-    script.src = scripts[0];
-    script.addEventListener("load", function() {
-      loadScripts(scripts.slice(1), cb);
-    }, { once: true });
-    document.head.appendChild(script);
-  }
-
   document.addEventListener("DOMContentLoaded", function() {
     window.addEventListener("message", function(event) {
-      loadScripts(event.data.scripts, function() {
-        var file = evalPureScript(event.data.sources)("<file>");
-        if (file.main && typeof file.main === "function") {
-          file.main();
-        }
-      });
       event.source.postMessage("trypurescript", "*");
+      var file = evalSources(event.data)("<file>");
+      if (file.main && typeof file.main === "function") {
+        file.main();
+      }
     }, { once: true });
   }, { once: true });
-})();
+})();