Remove ENABLE_CUSTOM_ELEMENTS compile time flag

Source/core/page/RuntimeEnabledFeatures.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 139 matching lines @@
 #if ENABLE(ENCRYPTED_MEDIA)
 bool RuntimeEnabledFeatures::isEncryptedMediaEnabled = false;
 #endif
 
 bool RuntimeEnabledFeatures::isShadowDOMEnabled = true;
 
 bool RuntimeEnabledFeatures::isExperimentalShadowDOMEnabled = false;
 
 bool RuntimeEnabledFeatures::isAuthorShadowDOMForAnyElementEnabled = false;
 
-#if ENABLE(CUSTOM_ELEMENTS)
 bool RuntimeEnabledFeatures::isCustomDOMElementsEnabled = false;
-#endif
 
 bool RuntimeEnabledFeatures::isStyleScopedEnabled = false;
 
 #if ENABLE(INPUT_TYPE_DATETIME_INCOMPLETE)
 bool RuntimeEnabledFeatures::isInputTypeDateTimeEnabled = false;
 #endif
 
 bool RuntimeEnabledFeatures::isInputTypeWeekEnabled = true;
 
 #if ENABLE(DIALOG_ELEMENT)
 bool RuntimeEnabledFeatures::isDialogElementEnabled = false;
 #endif
 
 bool RuntimeEnabledFeatures::isRequestAutocompleteEnabled = false;
 
 bool RuntimeEnabledFeatures::areExperimentalContentSecurityPolicyFeaturesEnabled = false;
 
 bool RuntimeEnabledFeatures::areSeamlessIFramesEnabled = false;
 
 bool RuntimeEnabledFeatures::isFontLoadEventsEnabled = false;
 
 bool RuntimeEnabledFeatures::isWebPInAcceptHeaderEnabled = false;
 
 bool RuntimeEnabledFeatures::isIMEAPIEnabled = false;
 
 } // namespace WebCore