Fix inconsistency.

build/config/linux/pkg-config.py

 # 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 json
 import os
 import subprocess
 import sys
 import re
 from optparse import OptionParser
@@ skipping 12 matching lines @@
 # system path to the sysroot used for compiling. This script will attempt to
 # generate correct paths for the sysroot.
 #
 # When using a sysroot, you must also specify the architecture via
 # "-a <arch>" where arch is either "x86" or "x64".
 
 # If this is run on non-Linux platforms, just return nothing and indicate
 # success. This allows us to "kind of emulate" a Linux build from other
 # platforms.
 if sys.platform.find("linux") == -1:
-  print "[[],[],[]]"
+  print "[[],[],[],[]]"
   sys.exit(0)
 
 
 def SetConfigPath(options):
   """Set the PKG_CONFIG_PATH environment variable.
   This takes into account any sysroot and architecture specification from the
   options on the given command line."""
 
   sysroot = options.sysroot
   if not sysroot:
@@ skipping 105 matching lines @@
     lib_dirs.append(RewritePath(flag[2:], prefix, sysroot))
   elif flag[:2] == '-I':
     includes.append(RewritePath(flag[2:], prefix, sysroot))
   else:
     cflags.append(flag)
 
 # Output a GN array, the first one is the cflags, the second are the libs. The
 # JSON formatter prints GN compatible lists when everything is a list of
 # strings.
 print json.dumps([includes, cflags, libs, lib_dirs])