Remove unused function on HTMLImportsController.

Source/core/html/imports/HTMLImportsController.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 106 matching lines @@
     HTMLImportLoader* loader = createLoader();
     HTMLImportChild* child = createChild(request.url(), loader, parent, client);
     // We set resource after the import tree is built since
     // Resource::addClient() immediately calls back to feed the bytes when the resource is cached.
     loader->startLoading(resource);
     child->didStartLoading();
 
     return child;
 }
 
-void HTMLImportsController::showSecurityErrorMessage(const String& message)
-{
-    master()->addConsoleMessage(JSMessageSource, ErrorMessageLevel, message);
-}
-
 Document* HTMLImportsController::master() const
 {
     return root()->document();
 }
 
 bool HTMLImportsController::shouldBlockScriptExecution(const Document& document) const
 {
     ASSERT(document.importsController() == this);
     if (HTMLImportLoader* loader = loaderFor(document))
         return loader->shouldBlockScriptExecution();
@@ skipping 17 matching lines @@
 {
     for (size_t i = 0; i < m_loaders.size(); ++i) {
         if (m_loaders[i]->document() == &document)
             return m_loaders[i].get();
     }
 
     return 0;
 }
 
 } // namespace WebCore