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

content/common/font_list.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_COMMON_FONT_LIST_H_
 #define CONTENT_COMMON_FONT_LIST_H_
 
+#include "base/memory/scoped_ptr.h"
+
 namespace base {
 class ListValue;
 }
 
 namespace content {
 
 // Retrieves the fonts available on the current platform and returns them.
 // The caller will own the returned pointer. Each entry will be a list of
 // two strings, the first being the font family, and the second being the
 // localized name.
 //
 // This function is potentially slow (the system may do a bunch of I/O) so be
 // sure not to call this on a time-critical thread like the UI or I/O threads.
 //
 // Most callers will want to use the GetFontListAsync function in
 // content/browser/font_list_async.h which does an asynchronous call.
-base::ListValue* GetFontList_SlowBlocking();
+scoped_ptr<base::ListValue> GetFontList_SlowBlocking();
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_FONT_LIST_H_