Remove redundant 'static' modifiers

enums, interfaces, and field members in interfaces are by default
static, so don't need to be explicitly declared so.

Change-Id: I29270c28be30965767519ad0105a7d93a24e0ab4

gerrit-server/src/main/java/com/google/gerrit/server/account/CapabilityControl.java

@@ -39,7 +39,7 @@ import java.util.Map;
 
 /** Access control management for server-wide capabilities. */
 public class CapabilityControl {
-  public static interface Factory {
+  public interface Factory {
     CapabilityControl create(CurrentUser user);
   }