Remove prettify JS

Leave CSS, since the Java prettify port uses the same class names,
but does not redistribute the CSS.

Change-Id: I98c6b987298509b6b35d584ca9d7b1202fb0da14

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

diff --git a/gitiles-servlet/src/main/java/com/google/gitiles/Renderer.java b/gitiles-servlet/src/main/java/com/google/gitiles/Renderer.java
index 643c389..9ac3f03 100644
--- a/gitiles-servlet/src/main/java/com/google/gitiles/Renderer.java
+++ b/gitiles-servlet/src/main/java/com/google/gitiles/Renderer.java
@@ -50,8 +50,7 @@
 
   public static final Map<String, String> STATIC_URL_GLOBALS = ImmutableMap.of(
       "gitiles.CSS_URL", "gitiles.css",
-      "gitiles.PRETTIFY_CSS_URL", "prettify/prettify.css",
-      "gitiles.PRETTIFY_JS_URL", "prettify/prettify.js");
+      "gitiles.PRETTIFY_CSS_URL", "prettify/prettify.css");
 
   protected static class FileUrlMapper implements Function<String, URL> {
     private final String prefix;