Require commas between items in a GN list.

net/BUILD.gn

 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//tools/grit/grit_rule.gni")
 
 if (is_android) {
   import("//build/config/android/config.gni")
 } else if (is_mac) {
   import("//build/config/mac/mac_sdk.gni")
 }
 
 # The list of net files is kept in net.gypi. Read it.
 gypi_values = exec_script(
     "//build/gypi_to_gn.py",
-    [ rebase_path("net.gypi") ]
+    [ rebase_path("net.gypi") ],
     "scope",
     [ "net.gypi" ])
 
 # Disable Kerberos on ChromeOS, Android and iOS, at least for now. It needs
 # configuration (krb5.conf and so on).
 use_kerberos = !is_chromeos && !is_android && !is_ios
 
 # The way the cache uses mmap() is inefficient on some Android devices. If
 # this flag is set, we hackily avoid using mmap() in the disk cache. We are
 # pretty confident that mmap-ing the index would not hurt any existing x86
@@ skipping 884 matching lines @@
 
 if (is_android || is_linux) {
   executable("disk_cache_memory_test") {
     sources = [ "tools/disk_cache_memory_test/disk_cache_memory_test.cc" ]
     deps = [
       ":net",
       "//base",
     ]
   }
 }