Replace deprecated FileResource with PathResource

Change-Id: I076166b304833cf786288376faaaf080e0551be7

gitiles-dev/src/main/java/com/google/gitiles/dev/DevServer.java

diff --git a/gitiles-dev/src/main/java/com/google/gitiles/dev/DevServer.java b/gitiles-dev/src/main/java/com/google/gitiles/dev/DevServer.java
index f8ca436..35a594f 100644
--- a/gitiles-dev/src/main/java/com/google/gitiles/dev/DevServer.java
+++ b/gitiles-dev/src/main/java/com/google/gitiles/dev/DevServer.java
@@ -45,7 +45,7 @@
 import org.eclipse.jetty.server.handler.ResourceHandler;
 import org.eclipse.jetty.servlet.ServletContextHandler;
 import org.eclipse.jetty.servlet.ServletHolder;
-import org.eclipse.jetty.util.resource.FileResource;
+import org.eclipse.jetty.util.resource.PathResource;
 import org.eclipse.jgit.errors.ConfigInvalidException;
 import org.eclipse.jgit.errors.RepositoryNotFoundException;
 import org.eclipse.jgit.lib.Config;
@@ -152,7 +152,7 @@
         sourceRoot.resolve("gitiles-servlet/src/main/resources/com/google/gitiles/static");
     ResourceHandler rh = new ResourceHandler();
     try {
-      rh.setBaseResource(new FileResource(staticRoot.toUri().toURL()));
+      rh.setBaseResource(new PathResource(staticRoot.toUri().toURL()));
     } catch (URISyntaxException e) {
       throw new IOException(e);
     }