Cache GitilesAccess in the request from BaseServlet

This will allow BaseServlet methods to reuse the same AccessFactory
as subclasses.

Change-Id: I9b160e6943591910b433fc02b382fb4412416380

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

diff --git a/gitiles-servlet/src/main/java/com/google/gitiles/LogServlet.java b/gitiles-servlet/src/main/java/com/google/gitiles/LogServlet.java
index e6ae4c2..ba979bc 100644
--- a/gitiles-servlet/src/main/java/com/google/gitiles/LogServlet.java
+++ b/gitiles-servlet/src/main/java/com/google/gitiles/LogServlet.java
@@ -69,8 +69,8 @@
 
   private final Linkifier linkifier;
 
-  public LogServlet(Renderer renderer, Linkifier linkifier) {
-    super(renderer);
+  public LogServlet(GitilesAccess.Factory accessFactory, Renderer renderer, Linkifier linkifier) {
+    super(renderer, accessFactory);
     this.linkifier = checkNotNull(linkifier, "linkifier");
   }