Remove unneeded RpcAuditEvent

RpcAuditEvent are no more used in Gerrit since the GWT UI has been
removed (https://gerrit-review.googlesource.com/c/gerrit/+/204940).
No need to audit them anymore.

Bug: Issue 10072
Change-Id: I523d0169e1e51baf43ab9593cec328c046de48c5

src/main/java/com/googlesource/gerrit/plugins/auditsl4j/AuditRendererToCsv.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/auditsl4j/AuditRendererToCsv.java b/src/main/java/com/googlesource/gerrit/plugins/auditsl4j/AuditRendererToCsv.java
index b5f7547..0dbbf74 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/auditsl4j/AuditRendererToCsv.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/auditsl4j/AuditRendererToCsv.java
@@ -18,7 +18,6 @@
 import com.google.gerrit.server.AuditEvent;
 import com.google.gerrit.server.audit.ExtendedHttpAuditEvent;
 import com.google.gerrit.server.audit.HttpAuditEvent;
-import com.google.gerrit.server.audit.RpcAuditEvent;
 import com.google.gerrit.server.audit.SshAuditEvent;
 import java.text.SimpleDateFormat;
 import java.util.Collection;
@@ -41,7 +40,6 @@
             {
               put(HttpAuditEvent.class, new HttpAuditEventFormat());
               put(ExtendedHttpAuditEvent.class, new HttpAuditEventFormat());
-              put(RpcAuditEvent.class, new RpcAuditEventFormat());
               put(SshAuditEvent.class, new SshAuditEventFormat());
               put(AuditEvent.class, new AuditEventFormat());
             }
@@ -51,13 +49,6 @@
     String formatToCsv(T result);
   }
 
-  static class RpcAuditEventFormat implements CsvFieldFormatter<RpcAuditEvent> {
-    @Override
-    public String formatToCsv(RpcAuditEvent result) {
-      return "RPC-" + result.httpMethod + ", Status:" + result.httpStatus;
-    }
-  }
-
   static class HttpAuditEventFormat implements CsvFieldFormatter<HttpAuditEvent> {
 
     @Override

src/main/java/com/googlesource/gerrit/plugins/auditsl4j/AuditWriterToStringList.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/auditsl4j/AuditWriterToStringList.java b/src/main/java/com/googlesource/gerrit/plugins/auditsl4j/AuditWriterToStringList.java
index e612792..6aab77b 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/auditsl4j/AuditWriterToStringList.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/auditsl4j/AuditWriterToStringList.java
@@ -15,7 +15,6 @@
 package com.googlesource.gerrit.plugins.auditsl4j;
 
 import com.google.gerrit.server.audit.HttpAuditEvent;
-import com.google.gerrit.server.audit.RpcAuditEvent;
 import com.google.inject.Singleton;
 import java.util.ArrayList;
 import java.util.List;