Remove the ENABLE_IFRAME_SEAMLESS compile-time flag.

Source/WebCore/bindings/generic/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 271 matching lines @@
 #if ENABLE(DIALOG_ELEMENT)
     static bool dialogElementEnabled() { return isDialogElementEnabled; }
     static void setDialogElementEnabled(bool isEnabled) { isDialogElementEnabled = isEnabled; }
 #endif
 
 #if ENABLE(CSP_NEXT)
     static bool experimentalContentSecurityPolicyFeaturesEnabled() { return areExperimentalContentSecurityPolicyFeaturesEnabled; }
     static void setExperimentalContentSecurityPolicyFeaturesEnabled(bool isEnabled) { areExperimentalContentSecurityPolicyFeaturesEnabled = isEnabled; }
 #endif
 
-#if ENABLE(IFRAME_SEAMLESS)
     static bool seamlessIFramesEnabled() { return areSeamlessIFramesEnabled; }
     static void setSeamlessIFramesEnabled(bool isEnabled) { areSeamlessIFramesEnabled = isEnabled; }
-#endif
 
     static bool langAttributeAwareFormControlUIEnabled() { return isLangAttributeAwareFormControlUIEnabled; }
     // The lang attribute support is incomplete and should only be turned on for tests.
     static void setLangAttributeAwareFormControlUIEnabled(bool isEnabled) { isLangAttributeAwareFormControlUIEnabled = isEnabled; }
 
 #if ENABLE(REQUEST_AUTOCOMPLETE)
     static bool requestAutocompleteEnabled() { return isRequestAutocompleteEnabled; }
     static void setRequestAutocompleteEnabled(bool isEnabled) { isRequestAutocompleteEnabled = isEnabled; }
 #endif
 
@@ skipping 105 matching lines @@
 #endif
 
 #if ENABLE(REQUEST_AUTOCOMPLETE)
     static bool isRequestAutocompleteEnabled;
 #endif
 
 #if ENABLE(CSP_NEXT)
     static bool areExperimentalContentSecurityPolicyFeaturesEnabled;
 #endif
 
-#if ENABLE(IFRAME_SEAMLESS)
     static bool areSeamlessIFramesEnabled;
-#endif
 
 #if ENABLE(FONT_LOAD_EVENTS)
     static bool isFontLoadEventsEnabled;
 #endif
 
 };
 
 } // namespace WebCore
 
 #endif // RuntimeEnabledFeatures_h