[benchmark] Remove out of date comment. NFC.

gottesmm · gottesmm · commit d3778565ee2b · 2018-05-28T18:18:52.000-07:00
diff --git a/benchmark/CMakeLists.txt b/benchmark/CMakeLists.txt
@@ -1,9 +1,4 @@
 # -*- mode: cmake -*-
-################################################################################
-# WARNING: This file is automatically generated from templates and should not
-# be directly modified. Instead, make changes to CMakeLists.text.gyb and run
-# scripts/generate_harness/generate_harness.py to regenerate this file.
-################################################################################
 
 cmake_minimum_required(VERSION 2.8.12)
 
