Run check_gn_headers on ClangToTLinux

BUG=733500

Change-Id: Iee053126ab61bdb99ba78bdc74e720ff179febc6
Reviewed-on: https://chromium-review.googlesource.com/567729
Reviewed-by: Dirk Pranke <[email protected]>
Commit-Queue: Wei-Yin Chen (陳威尹) <[email protected]>
Cr-Commit-Position: refs/heads/master@{#486770}
diff --git a/testing/scripts/check_gn_headers.py b/testing/scripts/check_gn_headers.py
index cb2520c3..6530ada7 100755
--- a/testing/scripts/check_gn_headers.py
+++ b/testing/scripts/check_gn_headers.py
@@ -44,4 +44,4 @@
     'run': main_run,
     'compile_targets': main_compile_targets,
   }
-  sys.exit(common.run_script(sys.argv[1:], funcs))
+  common.run_script(sys.argv[1:], funcs)