Don't use FollowFilter by default in LogServlet

Doing rename detection for path following on large files can be
expensive. This will be added back later as an option that can also be
disabled at the server level.

Change-Id: I303d887ef8fbcfa1d3b5e60ba155ffb82b4f2c66

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 4bc0d84..fbb2c90 100644
--- a/gitiles-servlet/src/main/java/com/google/gitiles/LogServlet.java
+++ b/gitiles-servlet/src/main/java/com/google/gitiles/LogServlet.java
@@ -15,6 +15,7 @@
 package com.google.gitiles;
 
 import static com.google.common.base.Preconditions.checkNotNull;
+
 import static javax.servlet.http.HttpServletResponse.SC_INTERNAL_SERVER_ERROR;
 import static javax.servlet.http.HttpServletResponse.SC_NOT_FOUND;
 
@@ -27,7 +28,6 @@
 import com.google.common.primitives.Longs;
 import com.google.gson.reflect.TypeToken;
 
-import org.eclipse.jgit.diff.DiffConfig;
 import org.eclipse.jgit.errors.IncorrectObjectTypeException;
 import org.eclipse.jgit.errors.MissingObjectException;
 import org.eclipse.jgit.errors.RevWalkException;
@@ -38,11 +38,11 @@
 import org.eclipse.jgit.lib.ObjectReader;
 import org.eclipse.jgit.lib.Ref;
 import org.eclipse.jgit.lib.Repository;
-import org.eclipse.jgit.revwalk.FollowFilter;
 import org.eclipse.jgit.revwalk.RevCommit;
 import org.eclipse.jgit.revwalk.RevObject;
 import org.eclipse.jgit.revwalk.RevTag;
 import org.eclipse.jgit.revwalk.RevWalk;
+import org.eclipse.jgit.treewalk.filter.PathFilter;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -190,9 +190,7 @@
       walk.markUninteresting(walk.parseCommit(view.getOldRevision().getId()));
     }
     if (!Strings.isNullOrEmpty(view.getPathPart())) {
-      walk.setTreeFilter(FollowFilter.create(
-        view.getPathPart(),
-        repo.getConfig().get(DiffConfig.KEY)));
+      walk.setTreeFilter(PathFilter.create(view.getPathPart()));
     }
     return walk;
   }