Remove ENABLE_CUSTOM_ELEMENTS compile time flag

Source/core/page/RuntimeEnabledFeatures.h

 /*
  * 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 181 matching lines @@
 
     static bool shadowDOMEnabled() { return isShadowDOMEnabled; }
     static void setShadowDOMEnabled(bool isEnabled) { isShadowDOMEnabled = isEnabled; }
 
     static bool experimentalShadowDOMEnabled() { return isExperimentalShadowDOMEnabled; }
     static void setExperimentalShadowDOMEnabled(bool isEnabled) { isExperimentalShadowDOMEnabled = isEnabled; }
 
     static bool authorShadowDOMForAnyElementEnabled() { return isAuthorShadowDOMForAnyElementEnabled; }
     static void setAuthorShadowDOMForAnyElementEnabled(bool isEnabled) { isAuthorShadowDOMForAnyElementEnabled = isEnabled; }
 
-#if ENABLE(CUSTOM_ELEMENTS)
     static bool customDOMElementsEnabled() { return isCustomDOMElementsEnabled; }
     static void setCustomDOMElements(bool isEnabled) { isCustomDOMElementsEnabled = isEnabled; }
-#endif
 
     static bool styleScopedEnabled() { return isStyleScopedEnabled; }
     static void setStyleScopedEnabled(bool isEnabled) { isStyleScopedEnabled = isEnabled; }
 
 #if ENABLE(INPUT_TYPE_DATETIME_INCOMPLETE)
     static bool inputTypeDateTimeEnabled() { return isInputTypeDateTimeEnabled; }
     static void setInputTypeDateTimeEnabled(bool isEnabled) { isInputTypeDateTimeEnabled = isEnabled; }
 #endif
 
     static bool inputTypeWeekEnabled() { return isInputTypeWeekEnabled; }
@@ skipping 75 matching lines @@
 #endif
 
     static bool isVideoTrackEnabled;
 
     static bool isShadowDOMEnabled;
 
     static bool isExperimentalShadowDOMEnabled;
 
     static bool isAuthorShadowDOMForAnyElementEnabled;
 
-#if ENABLE(CUSTOM_ELEMENTS)
     static bool isCustomDOMElementsEnabled;
-#endif
 
     static bool isStyleScopedEnabled;
 
 #if ENABLE(INPUT_TYPE_DATETIME_INCOMPLETE)
     static bool isInputTypeDateTimeEnabled;
 #endif
 
     static bool isInputTypeWeekEnabled;
 
 #if ENABLE(DIALOG_ELEMENT)
@@ skipping 13 matching lines @@
     static bool isDirectoryUploadEnabled;
 
     static bool isExperimentalWebSocketEnabled;
 
     static bool isIMEAPIEnabled;
 };
 
 } // namespace WebCore
 
 #endif // RuntimeEnabledFeatures_h