Add support for AMD to the extensions module system.

chrome/renderer/resources/extensions/app_window_custom_bindings.js

Index: chrome/renderer/resources/extensions/app_window_custom_bindings.js
diff --git a/chrome/renderer/resources/extensions/app_window_custom_bindings.js b/chrome/renderer/resources/extensions/app_window_custom_bindings.js
index 99ca8bcf2248723d0eff679c4a5fa7467f364592..51d25d79f8aec8533b692050d4964529e7eec5fa 100644
--- a/chrome/renderer/resources/extensions/app_window_custom_bindings.js
+++ b/chrome/renderer/resources/extensions/app_window_custom_bindings.js
@@ -5,7 +5,7 @@
 // Custom binding for the app_window API.
 
 var appWindowNatives = requireNative('app_window_natives');
-var runtimeNatives = requireNative('runtime');
+var runtimeNatives = requireNative('runtime_natives');
 var Binding = require('binding').Binding;
 var Event = require('event_bindings').Event;
 var forEach = require('utils').forEach;
@@ -391,4 +391,4 @@ function updateSizeConstraints(boundsType, constraints) {
 exports.binding = appWindow.generate();
 exports.onAppWindowClosed = onAppWindowClosed;
 exports.updateAppWindowProperties = updateAppWindowProperties;
-exports.appWindowShownForTests = onAppWindowShownForTests;
+exports.appWindowShownForTests = onAppWindowShownForTests;