Move font_list_async.h to content/public. Switch to Pass() goodness to simplify code.

content/public/browser/font_list_async.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CONTENT_BROWSER_FONT_LIST_ASYNC_H_
-#define CONTENT_BROWSER_FONT_LIST_ASYNC_H_
+#ifndef CONTENT_PUBLIC_BROWSER_FONT_LIST_ASYNC_H_
+#define CONTENT_PUBLIC_BROWSER_FONT_LIST_ASYNC_H_
 
 #include "base/callback_forward.h"
-#include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/common/content_export.h"
 
 namespace base {
 class ListValue;
 }
 
 namespace content {
 
-// Wraps ownership of a ListValue so we can send it across threads without
-// having ownership problems (for example if the calling thread goes away
-// before the callback is executed, we want the ListValue to be destroyed.
-struct CONTENT_EXPORT FontListResult
-    : public base::RefCountedThreadSafe<FontListResult> {
-  FontListResult();
-  ~FontListResult();
-
-  scoped_ptr<base::ListValue> list;
-};
-
 // Retrieves the list of fonts on the system as a list of strings. It provides
 // a non-blocking interface to GetFontList_SlowBlocking in common/.
 //
 // This function will run asynchronously on a background thread since getting
 // the font list from the system can be slow. This function may be called from
 // any thread that has a BrowserThread::ID. The callback will be executed on
 // the calling thread.
-//
-// If the caller wants to take ownership of the ListValue, it can just do
-// FontListResult.list.release() or use scoped_ptr.swap() because this value
-// isn't used for anything else.
 CONTENT_EXPORT void GetFontListAsync(
-    const base::Callback<void(scoped_refptr<FontListResult>)>& callback);
+    const base::Callback<void(scoped_ptr<base::ListValue>)>& callback);
 
 }  // namespace content
 
-#endif  // CONTENT_BROWSER_FONT_LIST_ASYNC_H_
+#endif  // CONTENT_PUBLIC_BROWSER_FONT_LIST_ASYNC_H_