Remove redundant modifiers reported by CheckStyle

- Interface fields are by default public static final

- Interface methods are by default public

- Constructors are by default private

- Enums are by default static

Change-Id: I68975e11174c2eda0237cbc4989ad3c19fe1297d

gitiles-servlet/src/main/java/com/google/gitiles/RefServlet.java

diff --git a/gitiles-servlet/src/main/java/com/google/gitiles/RefServlet.java b/gitiles-servlet/src/main/java/com/google/gitiles/RefServlet.java
index 63be2af..f434586 100644
--- a/gitiles-servlet/src/main/java/com/google/gitiles/RefServlet.java
+++ b/gitiles-servlet/src/main/java/com/google/gitiles/RefServlet.java
@@ -125,7 +125,7 @@
         return r - l;
       }
 
-      private final boolean isHead(Ref ref) {
+      private boolean isHead(Ref ref) {
         return ref != null && ref.getName().equals(headLeafName);
       }
     }.compound(RefComparator.INSTANCE);