BaseServlet: remove unused import of List

Change-Id: I9afbfd49cd55c10832c635808e072b87937967a3

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

diff --git a/gitiles-servlet/src/main/java/com/google/gitiles/BaseServlet.java b/gitiles-servlet/src/main/java/com/google/gitiles/BaseServlet.java
index 824339e..3e0e3bb 100644
--- a/gitiles-servlet/src/main/java/com/google/gitiles/BaseServlet.java
+++ b/gitiles-servlet/src/main/java/com/google/gitiles/BaseServlet.java
@@ -40,7 +40,6 @@
 import java.io.Writer;
 import java.lang.reflect.Type;
 import java.util.Map;
-import java.util.List;
 import java.util.regex.Pattern;
 import java.util.zip.GZIPOutputStream;
 import javax.servlet.ServletException;