only use kAccessibilityEnabled inside USE_GCONF ifdef blocks

ui/accessibility/platform/atk_util_auralinux.cc

Index: ui/accessibility/platform/atk_util_auralinux.cc
diff --git a/ui/accessibility/platform/atk_util_auralinux.cc b/ui/accessibility/platform/atk_util_auralinux.cc
index 98e98dff1698acd2f21e282cc5771f1a5fe05431..d428f4d270bea41adc0239bbde769dff50e2e92e 100644
--- a/ui/accessibility/platform/atk_util_auralinux.cc
+++ b/ui/accessibility/platform/atk_util_auralinux.cc
@@ -85,10 +85,12 @@ bool PlatformShouldEnableAccessibility() {
 #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;
 }