Implement a module system for the extension bindings JS.

chrome/renderer/resources/require.js

Index: chrome/renderer/resources/require.js
diff --git a/chrome/renderer/resources/require.js b/chrome/renderer/resources/require.js
index 34f3543a432fe5bcd2348aaf24c2e3b270b0eff9..7108616d7b5252285ec1ab9a86abc9b8d7cee78d 100644
--- a/chrome/renderer/resources/require.js
+++ b/chrome/renderer/resources/require.js
@@ -15,15 +15,9 @@
 //
 // |bootstrap| contains the following fields:
 //   - GetSource(module): returns the source code for |module|
-//   - Run(source): runs the string os JS |source|
 //   - GetNative(nativeName): returns the named native object
 (function(bootstrap) {
 
-function wrap(source) {
-  return "(function(require, requireNative, exports) {" + source +
-      "\n})";
-}
-
 function ModuleLoader() {
   this.cache_ = {};
 };
@@ -33,9 +27,8 @@ ModuleLoader.prototype.run = function(id) {
   if (!source) {
     return null;
   }
-  var wrappedSource = wrap(source);
-  var f = bootstrap.Run(wrappedSource);
   var exports = {};
+  var f = new Function("require", "requireNative", "exports", source);
   f(require, requireNative, exports);
   return exports;
 };
@@ -53,7 +46,11 @@ ModuleLoader.prototype.load = function(id) {
 var moduleLoader = new ModuleLoader();
 
 function requireNative(nativeName) {
-  return bootstrap.GetNative(nativeName);
+  var result = bootstrap.GetNative(nativeName);
+  if (!result) {
+    throw "No such native object: '" + nativeName + "'";
+  }
+  return result;
 }
 
 function require(moduleId) {