Update the gyp Linux build:

build/linux/system.gyp

Index: build/linux/system.gyp
===================================================================
--- build/linux/system.gyp	(revision 0)
+++ build/linux/system.gyp	(revision 0)
@@ -0,0 +1,50 @@
+# 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)',
+        ],
+      },
+      'link_settings': {
+        'libraries': [
+          '<!@(python ../build/linux/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)',
+        ],
+      },
+      'link_settings': {
+        'libraries': [
+          '<!@(python ../build/linux/pkg_config_wrapper.py --libs nss)',
+        ],
+      },
+    },
+    {
+      'target_name': 'pangoft2',
+      'type': 'settings',
+      'direct_dependent_settings': {
+        'cflags': [
+          '<!@(python ../build/linux/pkg_config_wrapper.py --cflags pangoft2)',
+        ],
+      },
+      'link_settings': {
+        'libraries': [
+          '<!@(python ../build/linux/pkg_config_wrapper.py --libs pangoft2)',
+        ],
+      },
+    },
+  ],
+}