Don't expose document.register to Chrome Apps by default.

chrome/renderer/resources/extensions/web_view.js

Index: chrome/renderer/resources/extensions/web_view.js
diff --git a/chrome/renderer/resources/extensions/web_view.js b/chrome/renderer/resources/extensions/web_view.js
index 7eed1798cceed12f04cfe07ba9ea4965b9c7bce5..7615d778f894b0513f3a170f4682e769b6b199db 100644
--- a/chrome/renderer/resources/extensions/web_view.js
+++ b/chrome/renderer/resources/extensions/web_view.js
@@ -13,6 +13,7 @@ var eventBindings = require('event_bindings');
 var WebRequestEvent = require('webRequestInternal').WebRequestEvent;
 var webRequestSchema =
     requireNative('schema_registry').GetSchema('webRequest');
+var WebviewNatives = requireNative('webview_natives');
 
 // This secret enables hiding <webview> private members from the outside scope.
 // Outside of this file, |secret| is inaccessible. The only way to access the
@@ -703,7 +704,7 @@ WebViewInternal.prototype.setupWebRequestEvents_ = function() {
 
 // Save document.register in a variable in case the developer attempts to

[dominicc (has gone to gerrit), 2013/08/17 00:13:12]

This comment can go now. No author is going to override you now.

[Fady Samuel, 2013/08/20 23:00:39]

Done.

 // override it at some point.
-var register = document.register;
+var register = WebviewNatives.RegisterElement;
 
 // Registers browser plugin <object> custom element.
 function registerBrowserPluginElement() {