iwyu: Use callback_old.h where appropriate, part 2.

chrome/browser/icon_manager.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.
 //
 // Class for finding and caching Windows explorer icons. The IconManager
 // lives on the UI thread but performs icon extraction work on the file thread
 // to avoid blocking the UI thread with potentially expensive COM and disk
 // operations.
 //
 // Terminology
@@ skipping 30 matching lines @@
 //
 // Icon bitmaps returned should be treated as const since they may be referenced
 // by other clients. Make a copy of the icon if you need to modify it.
 
 #ifndef CHROME_BROWSER_ICON_MANAGER_H_
 #define CHROME_BROWSER_ICON_MANAGER_H_
 #pragma once
 
 #include <map>
 
-#include "base/callback.h"
+#include "base/callback_old.h"
 #include "base/hash_tables.h"
 #include "chrome/browser/icon_loader.h"
 #include "content/browser/cancelable_request.h"
 #include "ui/gfx/image.h"
 
 class FilePath;
 
 class IconManager : public IconLoader::Delegate,
                     public CancelableRequestProvider {
  public:
@@ skipping 47 matching lines @@
 
   // Asynchronous requests that have not yet been completed.
   struct ClientRequest;
   typedef std::map<IconLoader*, ClientRequest> ClientRequests;
   ClientRequests requests_;
 
   DISALLOW_COPY_AND_ASSIGN(IconManager);
 };
 
 #endif  // CHROME_BROWSER_ICON_MANAGER_H_