Make GConf dependency optional.

build/common.gypi

 # Copyright (c) 2010 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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   'variables': {
     # .gyp files or targets should set chromium_code to 1 if they build
@@ skipping 296 matching lines @@
     # Enable new NPDevice API.
     'enable_new_npdevice_api%': 0,
 
     # Enable EGLImage support in OpenMAX
     'enable_eglimage%': 0,
 
     # Enable a variable used elsewhere throughout the GYP files to determine
     # whether to compile in the sources for the GPU plugin / process.
     'enable_gpu%': 1,
 
+    # Use GConf, the GNOME configuration system.
+    'use_gconf%': 1,
+
     # Use OpenSSL instead of NSS. Currently in development.
     'use_openssl%': 0,
 
     'conditions': [
       ['OS=="linux" or OS=="freebsd" or OS=="openbsd"', {
         # This will set gcc_version to XY if you are running gcc X.Y.*.
         # This is used to tweak build flags for gcc 4.4.
         'gcc_version%': '<!(python <(DEPTH)/build/compiler_version.py)',
         # Figure out the python architecture to decide if we build pyauto.
         'python_arch%': '<!(<(DEPTH)/build/linux/python_arch.sh <(sysroot)/usr/lib/libpython<(python_ver).so.1.0)',
@@ skipping 1191 matching lines @@
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }
 
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