LibWeb/CSP: Add Keyword Sources FlyStrings

Author: https://github.com/Lubrsi
Commit: 050f984625
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/4367
Reviewed-by: https://github.com/ADKaster
Reviewed-by: https://github.com/shannonbooth

Libraries/LibWeb/ContentSecurityPolicy/Directives/Names.h

@@ -39,6 +39,4 @@ namespace Web::ContentSecurityPolicy::Directives::Names {
 ENUMERATE_DIRECTIVE_NAMES
 #undef __ENUMERATE_DIRECTIVE_NAME
 
-void initialize_strings();
-
 }