No need to wrap a runnable with a runnable.

Just pass the runnable to the method that takes a runnable.

Change-Id: I44d6413077e9b5a5a3cef177a7d18670031e8025
diff --git a/gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/SideBySide2.java b/gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/SideBySide2.java
index 7670172..0546cb9 100644
--- a/gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/SideBySide2.java
+++ b/gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/SideBySide2.java
@@ -294,12 +294,7 @@
     cm.on("cursorActivity", updateActiveLine(cm));
     cm.on("gutterClick", onGutterClick(cm));
     cm.on("viewportChange", adjustGutters(cm));
-    cm.on("focus", new Runnable() {
-      @Override
-      public void run() {
-        updateActiveLine(cm).run();
-      }
-    });
+    cm.on("focus", updateActiveLine(cm));
     cm.addKeyMap(KeyMap.create()
         .on("'a'", upToChange(true))
         .on("'u'", upToChange(false))