Add removeAll method to sets and maps and use them

Source/web/AssociatedURLLoader.cpp

 /*
  * Copyright (C) 2010, 2011, 2012 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 93 matching lines @@
 
 const HTTPHeaderSet& HTTPResponseHeaderValidator::blockedHeaders()
 {
     // Remove exposed headers from the blocked set.
     if (!m_exposedHeaders.isEmpty()) {
         // Don't allow Set-Cookie headers to be exposed.
         m_exposedHeaders.remove("set-cookie");
         m_exposedHeaders.remove("set-cookie2");
         // Block Access-Control-Expose-Header itself. It could be exposed later.
         m_blockedHeaders.add("access-control-expose-headers");
-        HTTPHeaderSet::const_iterator end = m_exposedHeaders.end();
-        for (HTTPHeaderSet::const_iterator it = m_exposedHeaders.begin(); it != end; ++it)
-            m_blockedHeaders.remove(*it);
+        m_blockedHeaders.removeAll(m_exposedHeaders);
     }
 
     return m_blockedHeaders;
 }
 
 }
 
 // This class bridges the interface differences between WebCore and WebKit loader clients.
 // It forwards its ThreadableLoaderClient notifications to a WebURLLoaderClient.
 class AssociatedURLLoader::ClientAdapter FINAL : public DocumentThreadableLoaderClient {
@@ skipping 241 matching lines @@
         m_loader->cancel();
 }
 
 void AssociatedURLLoader::setDefersLoading(bool defersLoading)
 {
     if (m_loader)
         m_loader->setDefersLoading(defersLoading);
 }
 
 } // namespace blink