Fix pkg_config_wrapper.py paths now that the updated gyp executes...

build/linux/system.gyp

 # Copyright (c) 2009 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.
 
 {
   'targets': [
     {
       'target_name': 'gtk',
       'type': 'settings',
       'direct_dependent_settings': {
         'cflags': [
-          '<!@(python ../build/linux/pkg_config_wrapper.py --cflags gtk+-2.0)',
+          '<!@(python pkg_config_wrapper.py --cflags gtk+-2.0)',
         ],
       },
       'link_settings': {
         'libraries': [
-          '<!@(python ../build/linux/pkg_config_wrapper.py --libs gtk+-2.0)',
+          '<!@(python pkg_config_wrapper.py --libs gtk+-2.0)',
         ],
       },
     },
     {
       'target_name': 'nss',
       'type': 'settings',
       'direct_dependent_settings': {
         'cflags': [
-          '<!@(python ../build/linux/pkg_config_wrapper.py --cflags nss)',
+          '<!@(python pkg_config_wrapper.py --cflags nss)',
         ],
       },
       'link_settings': {
         'libraries': [
-          '<!@(python ../build/linux/pkg_config_wrapper.py --libs nss)',
+          '<!@(python pkg_config_wrapper.py --libs nss)',
         ],
       },
     },
     {
       'target_name': 'pangoft2',
       'type': 'settings',
       'direct_dependent_settings': {
         'cflags': [
-          '<!@(python ../build/linux/pkg_config_wrapper.py --cflags pangoft2)',
+          '<!@(python pkg_config_wrapper.py --cflags pangoft2)',
         ],
       },
       'link_settings': {
         'libraries': [
-          '<!@(python ../build/linux/pkg_config_wrapper.py --libs pangoft2)',
+          '<!@(python pkg_config_wrapper.py --libs pangoft2)',
         ],
       },
     },
   ],
 }