Remove ENABLE_CUSTOM_ELEMENTS compile time flag

Source/core/scripts/make_names.pl

Index: Source/core/scripts/make_names.pl
diff --git a/Source/core/scripts/make_names.pl b/Source/core/scripts/make_names.pl
index 31d1f217a51e68a8cbf9b1257273bcb5b9adc460..49db2dc8327d5a39edb69869fa683b0912460ac1 100755
--- a/Source/core/scripts/make_names.pl
+++ b/Source/core/scripts/make_names.pl
@@ -856,10 +856,8 @@ print F <<END
 #include "ContextFeatures.h"
 #include "RuntimeEnabledFeatures.h"
 
-#if ENABLE(CUSTOM_ELEMENTS)
 #include "CustomElementConstructor.h"
 #include "CustomElementRegistry.h"
-#endif
 
 #if ENABLE(VIDEO)
 #include "Document.h"
@@ -922,7 +920,6 @@ END
 ;
 
 print F <<END
-#if ENABLE(CUSTOM_ELEMENTS)
     if (document->registry()) {
         if (RefPtr<CustomElementConstructor> constructor = document->registry()->find(nullQName(), qName)) {
             RefPtr<Element> element = constructor->createElement();
@@ -930,7 +927,6 @@ print F <<END
             return static_pointer_cast<$parameters{namespace}Element>(element.release());
         }
     }
-#endif
 
     if (!gFunctionMap)
         createFunctionMap();
@@ -1206,9 +1202,7 @@ END
         print F <<END
 #include "V8$parameters{namespace}Element.h"
 
-#if ENABLE(CUSTOM_ELEMENTS)
 #include "CustomElementHelpers.h"
-#endif
 
 #include <v8.h>
 END
@@ -1283,10 +1277,8 @@ END
 ;
     if ($wrapperFactoryType eq "V8") {
         print F <<END
-#if ENABLE(CUSTOM_ELEMENTS)
     if (PassRefPtr<CustomElementConstructor> constructor = CustomElementHelpers::constructorOf(element))
         return CustomElementHelpers::wrap(element, creationContext, constructor, isolate);
-#endif
 END
 ;
     }