Add CSP header for resources with an active policy

Source/core/fetch/FetchContext.cpp

 /*
  * Copyright (C) 2013 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 102 matching lines @@
 }
 
 void FetchContext::upgradeInsecureRequest(FetchRequest&)
 {
 }
 
 void FetchContext::addClientHintsIfNecessary(FetchRequest&)
 {
 }
 
+void FetchContext::addCSPHeaderIfNecessary(Resource::Type, FetchRequest&)
+{
+}
+
 } // namespace blink