Move const string declaration into #ifdef USE_GIO block

net/proxy/proxy_config_service_linux.cc

Index: net/proxy/proxy_config_service_linux.cc
diff --git a/net/proxy/proxy_config_service_linux.cc b/net/proxy/proxy_config_service_linux.cc
index 6fbf3d58694499b2a7a04325b0495e90ac5b1c16..158fd5c1ff72d405eacec058b746d97065f7317b 100644
--- a/net/proxy/proxy_config_service_linux.cc
+++ b/net/proxy/proxy_config_service_linux.cc
@@ -205,7 +205,6 @@ bool ProxyConfigServiceLinux::Delegate::GetConfigFromEnv(ProxyConfig* config) {
 namespace {
 
 const int kDebounceTimeoutMilliseconds = 250;
-const char kProxyGConfSchema[] = "org.gnome.system.proxy";
 
 #if defined(USE_GCONF)
 // This setting getter uses gconf, as used in GNOME 2 and some GNOME 3 desktops.
@@ -521,6 +520,8 @@ class SettingGetterImplGConf : public ProxyConfigServiceLinux::SettingGetter {
 #endif  // defined(USE_GCONF)
 
 #if defined(USE_GIO)
+const char kProxyGConfSchema[] = "org.gnome.system.proxy";
+
 // This setting getter uses gsettings, as used in most GNOME 3 desktops.
 class SettingGetterImplGSettings
     : public ProxyConfigServiceLinux::SettingGetter {