Bug 1525324 - [geckoview] Use default theme for CHANGELOG. r=fluffyemily

Differential Revision: https://phabricator.services.mozilla.com/D18711

--HG--
extra : moz-landing-system : lando

mobile/android/geckoview/src/main/java/org/mozilla/geckoview/doc-files/CHANGELOG.md

@@ -1,7 +1,9 @@
 ---
-layout: geckoview
+layout: default
 title: API Changelog
 description: GeckoView API Changelog.
+nav_exclude: true
+exclude: true
 ---
 
 <h1> GeckoView API Changelog. </h1>

mobile/android/geckoview/src/main/java/org/mozilla/geckoview/package-info.java

@@ -43,6 +43,6 @@
  *     <li>{@link android.Manifest.permission#RECORD_AUDIO}</li>
  * </ul>
  *
- * For a detailed change log of the API see: <a href="./doc-files/CHANGELOG">CHANGELOG</a>.
+ * For a detailed change log of the API see: <a href="./doc-files/CHANGELOG" target="_blank">CHANGELOG</a>.
  */
 package org.mozilla.geckoview;