Refactored extensionOptions to use the new guestViewAttributes module.

extensions/renderer/resources/guest_view/web_view/web_view.js

Index: extensions/renderer/resources/guest_view/web_view/web_view.js
diff --git a/extensions/renderer/resources/guest_view/web_view/web_view.js b/extensions/renderer/resources/guest_view/web_view/web_view.js
index c061c8387c3e4d403c7e4b7778551fc54b0cea04..1b40d156f2ef994b235fb4ed3f581d6d8aafa698 100644
--- a/extensions/renderer/resources/guest_view/web_view/web_view.js
+++ b/extensions/renderer/resources/guest_view/web_view/web_view.js
@@ -18,9 +18,7 @@ var WebViewInternal = require('webViewInternal').WebViewInternal;
 function WebViewImpl(webviewElement) {
   GuestViewContainer.call(this, webviewElement, 'webview');
 
-  this.setupWebViewAttributes();
   this.setupElementProperties();
-
   new WebViewEvents(this, this.viewInstanceId);
 }
 
@@ -98,17 +96,6 @@ WebViewImpl.prototype.setupElementProperties = function() {
   });
 };
 
-// This observer monitors mutations to attributes of the <webview>.
-WebViewImpl.prototype.handleAttributeMutation = function(
-    attributeName, oldValue, newValue) {
-  if (!this.attributes[attributeName]) {
-    return;
-  }
-
-  // Let the changed attribute handle its own mutation;
-  this.attributes[attributeName].maybeHandleMutation(oldValue, newValue);
-};
-
 WebViewImpl.prototype.onSizeChanged = function(webViewEvent) {
   var newWidth = webViewEvent.newWidth;
   var newHeight = webViewEvent.newHeight;