Remove .html extension from links

chrome/common/extensions/docs/templates/articles/experimental.html

Index: chrome/common/extensions/docs/templates/articles/experimental.html
diff --git a/chrome/common/extensions/docs/templates/articles/experimental.html b/chrome/common/extensions/docs/templates/articles/experimental.html
index 54ab09f8d4747708cf1426e01cfe2205745b9628..fc83eae017d20b68e71a8f781508d715ebc32441 100644
--- a/chrome/common/extensions/docs/templates/articles/experimental.html
+++ b/chrome/common/extensions/docs/templates/articles/experimental.html
@@ -20,7 +20,7 @@ which we expect to finalize soon:
 <b>devtools</b>,
 <b>permissions</b>,
 For examples of using the experimental APIs, see
-<a href="samples.html#experimental">Samples</a>.
+<a href="samples#experimental">Samples</a>.
 </p>
 {{/is_apps}}
 
@@ -50,7 +50,7 @@ upload items that use experimental APIs.
   {{/is_apps}}
   <li>
     Specify the "experimental"
-    <a href="declare_permissions.html">permission</a>
+    <a href="declare_permissions">permission</a>
     in your manifest, like this:
 <pre data-filename="manifest.json">
 "permissions": [
@@ -97,6 +97,6 @@ upload items that use experimental APIs.
 
 <p>
 For information on the standard APIs, see
-<a href="api_index.html">chrome.* APIs</a> and
-<a href="api_other.html">Other APIs</a>.
+<a href="api_index">chrome.* APIs</a> and
+<a href="api_other">Other APIs</a>.
 </p>