Remove the remains of unused guards.

LayoutTests/fast/dom/Window/window-properties-device-orientation.html

 <p>This test dumps all of the properties that are reachable from the window.DeviceMotionEvent window.ondevicemotion, window.DeviceOrientationEvent and window.ondeviceorientation objects, along with their types.
-  These properties are currently guarded by ENABLE_DEVICE_ORIENTATION.</p>
+  These properties are currently enabled by a runtime flag.</p>
 <hr>
 <pre id="pre"></pre>
 
 <script>
 if (window.testRunner)
     testRunner.dumpAsText();
     
 var logBuffer = [];
 function log(s)
 {
@@ skipping 75 matching lines @@
         logValue(objectName + "." + property);
     }
 }
 
 logValue('window.DeviceMotionEvent');
 logValue('window.ondevicemotion');
 logValue('window.DeviceOrientationEvent');
 logValue('window.ondeviceorientation');
 flushLog();
 </script>