Don't log and throw exception.

deleteSingleRef already throws IOException, so no need to catch it.

Change-Id: I07819a4af9fe7737cc344e145bf591fa00dd8ca1
diff --git a/java/com/google/gerrit/server/restapi/project/DeleteRef.java b/java/com/google/gerrit/server/restapi/project/DeleteRef.java
index 0016354..b7fbff4 100644
--- a/java/com/google/gerrit/server/restapi/project/DeleteRef.java
+++ b/java/com/google/gerrit/server/restapi/project/DeleteRef.java
@@ -132,9 +132,6 @@
           result = u.delete();
         } catch (LockFailedException e) {
           result = RefUpdate.Result.LOCK_FAILURE;
-        } catch (IOException e) {
-          logger.atSevere().withCause(e).log("Cannot delete %s", ref);
-          throw e;
         }
         if (result == RefUpdate.Result.LOCK_FAILURE && --remainingLockFailureCalls > 0) {
           try {