Make GConf dependency optional.

chrome/browser/gtk/gconf_titlebar_listener.cc

Index: chrome/browser/gtk/gconf_titlebar_listener.cc
diff --git a/chrome/browser/gtk/gconf_titlebar_listener.cc b/chrome/browser/gtk/gconf_titlebar_listener.cc
index 81b5ef0dae94f7dac32c4599028cbd2a1fc55394..237332fdbb4945720cc2e9cb7b618b34f109eed2 100644
--- a/chrome/browser/gtk/gconf_titlebar_listener.cc
+++ b/chrome/browser/gtk/gconf_titlebar_listener.cc
@@ -13,10 +13,6 @@
 
 namespace {
 
-// A default button order string for when we aren't asking gconf for the
-// metacity configuration.
-const char* kDefaultButtonPlacement = ":minimize,maximize,close";
-
 // The GConf key we read for the button placement string. Even through the key
 // has "metacity" in it, it's shared between metacity and compiz.
 const char* kButtonLayoutKey = "/apps/metacity/general/button_layout";
@@ -34,7 +30,7 @@ void GConfTitlebarListener::SetTitlebarButtons(BrowserTitlebar* titlebar) {
     titlebar->BuildButtons(current_value_);
     titlebars_.insert(titlebar);
   } else {
-    titlebar->BuildButtons(kDefaultButtonPlacement);
+    titlebar->BuildButtons(BrowserTitlebar::kDefaultButtonString);
   }
 }
 
@@ -113,8 +109,8 @@ bool GConfTitlebarListener::HandleGError(GError* error, const char* key) {
 void GConfTitlebarListener::ParseAndStoreValue(GConfValue* gconf_value) {
   if (gconf_value) {
     const char* value = gconf_value_get_string(gconf_value);
-    current_value_ = value ? value : kDefaultButtonPlacement;
+    current_value_ = value ? value : BrowserTitlebar::kDefaultButtonString;
   } else {
-    current_value_ = kDefaultButtonPlacement;
+    current_value_ = BrowserTitlebar::kDefaultButtonString;
   }
 }