REGRESSION(r171966): Custom elements in async imports don't get upgrade.

Source/core/html/imports/HTMLImportChild.h

 /*
  * 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 66 matching lines @@
 
 #if !defined(NDEBUG)
     virtual void showThis() OVERRIDE;
 #endif
 
     void setClient(HTMLImportChildClient*);
     void clearClient();
     bool loaderHasError() const;
 
     void didFinishLoading();
+    void didFinishMicrotask();

[dominicc (has gone to gerrit), 2014/04/30 23:57:20]

I think this name is too vague to the point of being misleading... this means
that custom elements are finished, right? That may have happened over the course
of many microtasks.

 
 private:
     // RawResourceOwner doing nothing.
     // HTMLImportChild owns the resource so that the contents of prefetched Resource doesn't go away.
     virtual void responseReceived(Resource*, const ResourceResponse&) OVERRIDE { }
     virtual void dataReceived(Resource*, const char*, int) OVERRIDE { }
     virtual void notifyFinished(Resource*) OVERRIDE { }
 
     void didFinish();
     void createLoader();
@@ skipping 13 matching lines @@
 
 inline HTMLImportChild* toHTMLImportChild(HTMLImport* import)
 {
     ASSERT(!import || import->isChild());
     return static_cast<HTMLImportChild*>(import);
 }
 
 } // namespace WebCore
 
 #endif // HTMLImportChild_h