Simplify ownership handling of HTMLImportsController.

third_party/WebKit/Source/core/html/imports/LinkImport.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 55 matching lines @@
 void LinkImport::process()
 {
     if (m_child)
         return;
     if (!m_owner)
         return;
     if (!shouldLoadResource())
         return;
 
     if (!m_owner->document().importsController()) {
-        ASSERT(m_owner->document().frame()); // The document should be the master.
-        HTMLImportsController::provideTo(m_owner->document());
+        // The document should be the master.
+        Document& master = m_owner->document();
+        ASSERT(master.frame());
+        master.setImportsController(HTMLImportsController::create(master));
     }
 
     LinkRequestBuilder builder(m_owner);
     if (!builder.isValid()) {
         didFinish();
         return;
     }
 
     HTMLImportsController* controller = m_owner->document().importsController();
     HTMLImportLoader* loader = m_owner->document().importLoader();
@@ skipping 41 matching lines @@
 }
 
 DEFINE_TRACE(LinkImport)
 {
     visitor->trace(m_child);
     HTMLImportChildClient::trace(visitor);
     LinkResource::trace(visitor);
 }
 
 } // namespace blink