Remove .html extension from links

chrome/common/extensions/docs/templates/intros/notifications.html

Index: chrome/common/extensions/docs/templates/intros/notifications.html
diff --git a/chrome/common/extensions/docs/templates/intros/notifications.html b/chrome/common/extensions/docs/templates/intros/notifications.html
index 683815ba3ae8d6a9b2246d9b8cfbabeda2c7f510..72faadd9e600997d9e35a4b90bcfccf7d431a49c 100644
--- a/chrome/common/extensions/docs/templates/intros/notifications.html
+++ b/chrome/common/extensions/docs/templates/intros/notifications.html
@@ -31,9 +31,9 @@ as well as an <code>iconUrl</code>, which is a link to a small icon that
 is displayed to the left of the notification message. The <code>image</code>
 template type also includes an <code>imageUrl</code>, which is a link to
 an image that is previewed within the notification.
-Due to a strict <a href="contentSecurityPolicy.html">Content Security Policy</a>
+Due to a strict <a href="contentSecurityPolicy">Content Security Policy</a>
 in Chrome Apps, these URLs must point to a local resource or use a
-<a href="app_external.html">data URL</a>.
+<a href="app_external">data URL</a>.
 </p>
 
 <p>
@@ -82,6 +82,6 @@ $(ref:notifications.onButtonClicked) event.
 </p>
 
 <p>Consider including event listeners and handlers within the
-  <a href="app_lifecycle.html#create_event_page">event page</a>,
+  <a href="app_lifecycle#create_event_page">event page</a>,
 so that notifications can pop-up even when the app or extension isn't running.
 </p>