Delegate canPerformGC functionality to the wrapped instance

MultiSiteGitRepositoryManager wraps LocalDiskRepositoryManager. Delegate
canPerformGC call to the delegate instead of calling default method from
the GitRepositoryManager interface.

Bug Issue 14097
Change-Id: I07b8ea5d2fc6c169e7a61431c9dec561e2f00ae3

src/main/java/com/googlesource/gerrit/plugins/multisite/validation/MultiSiteGitRepositoryManager.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/multisite/validation/MultiSiteGitRepositoryManager.java b/src/main/java/com/googlesource/gerrit/plugins/multisite/validation/MultiSiteGitRepositoryManager.java
index 8ce1f59..594b4a0 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/multisite/validation/MultiSiteGitRepositoryManager.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/multisite/validation/MultiSiteGitRepositoryManager.java
@@ -51,6 +51,11 @@
   }
 
   @Override
+  public Boolean canPerformGC() {
+    return gitRepositoryManager.canPerformGC();
+  }
+
+  @Override
   public SortedSet<Project.NameKey> list() {
     return gitRepositoryManager.list();
   }