Remove gconf build dependence for Chrome OS.

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index 645c337a3c1f4b6f31544e8e6aeb6f580eeb4491..7f16b21c3f8e127873bde7c597bbd9524c1c3786 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -320,9 +320,6 @@
     # 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. Under development: see http://crbug.com/62803
     'use_openssl%': 0,
 
@@ -443,6 +440,13 @@
         'libjpeg_gyp_path': '../third_party/libjpeg/libjpeg.gyp',
       }],  # use_libjpeg_turbo==1
 
+      # Use GConf, the GNOME configuration system.
+      ['chromeos==1', {
+        'use_gconf%': 0,
+      }, {
+        'use_gconf%': 1,
+      }],
+
       # Setup -D flags passed into grit.
       ['chromeos==1', {
         'grit_defines': ['-D', 'chromeos'],