Revert "Update to Checkstyle 8.7" am: 3518c40e86
am: c4189d24a5

Change-Id: Id13a5691c571f473d5527570c1944d640e7914d0
diff --git a/checkstyle.jar b/checkstyle.jar
index 9ccb44b..747b3e3 100644
--- a/checkstyle.jar
+++ b/checkstyle.jar
Binary files differ
diff --git a/default-treewalker-checks.xml b/default-treewalker-checks.xml
index f86f1dc..8ae9f56 100644
--- a/default-treewalker-checks.xml
+++ b/default-treewalker-checks.xml
@@ -210,6 +210,7 @@
 <module name="OuterTypeFilename">
   <property name="severity" value="error"/>
 </module>
+<module name="FileContentsHolder"/>
 <module name="SuppressionCommentFilter">
   <property name="offCommentFormat" value="CHECKSTYLE:OFF IndentationCheck"/>
   <property name="onCommentFormat" value="CHECKSTYLE:ON IndentationCheck"/>