only use kAccessibilityEnabled inside USE_GCONF ifdef blocks

ui/accessibility/platform/atk_util_auralinux.cc

 // Copyright 2015 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.
 
 #include <atk/atk.h>
 #if defined(USE_GCONF)
 #include <gconf/gconf-client.h>
 #endif
 #include <glib-2.0/gmodule.h>
 
@@ skipping 67 matching lines @@
 #else  // !defined(USE_GCONF)
 
 bool PlatformShouldEnableAccessibility() {
   // TODO(iceman): implement this for non-GNOME desktops.
   return false;
 }
 
 #endif  // defined(USE_GCONF)
 
 bool ShouldEnableAccessibility() {
+#if defined(USE_GCONF)
   char* enable_accessibility = getenv(kAccessibilityEnabled);
   if ((enable_accessibility && atoi(enable_accessibility) == 1) ||
       PlatformShouldEnableAccessibility())
     return true;
+#endif  // defined(USE_GCONF)
 
   return false;
 }
 
 }  // namespace
 
 G_BEGIN_DECLS
 
 //
 // atk_util_auralinux AtkObject definition and implementation.
@@ skipping 133 matching lines @@
 
 void AtkUtilAuraLinux::CheckIfAccessibilityIsEnabledOnFileThread() {
 }
 
 void AtkUtilAuraLinux::FinishAccessibilityInitOnUIThread() {
 }
 
 #endif // defined(USE_GCONF)
 
 }  // namespace ui