Exclude web_sessions cache from cache-eviction events propagation

This change prevents removing active web sessions from local cache.
There is no need to propagate cache-eviction events because websession
plugins are managing cache expiration.

Feature: Issue 11276
Change-Id: If7fae62642b6da201fe175e13f52a803fba63974
diff --git a/src/main/java/com/googlesource/gerrit/plugins/multisite/cache/CachePatternMatcher.java b/src/main/java/com/googlesource/gerrit/plugins/multisite/cache/CachePatternMatcher.java
index f815c92..cd86848 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/multisite/cache/CachePatternMatcher.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/multisite/cache/CachePatternMatcher.java
@@ -27,13 +27,7 @@
 class CachePatternMatcher {
   private static final List<String> DEFAULT_PATTERNS =
       ImmutableList.of(
-          "^accounts.*",
-          "^groups.*",
-          "ldap_groups",
-          "ldap_usernames",
-          "projects",
-          "sshkeys",
-          "web_sessions");
+          "^accounts.*", "^groups.*", "ldap_groups", "ldap_usernames", "projects", "sshkeys");
 
   private final Pattern pattern;