chrome: Add out-of-line copy ctors for complex classes.

chrome/browser/ui/webui/fileicon_source.h

 // Copyright (c) 2012 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 CHROME_BROWSER_UI_WEBUI_FILEICON_SOURCE_H_
 #define CHROME_BROWSER_UI_WEBUI_FILEICON_SOURCE_H_
 
 #include <string>
 
 #include "base/files/file_path.h"
@@ skipping 30 matching lines @@
   virtual void FetchFileIcon(
       const base::FilePath& path,
       float scale_factor,
       IconLoader::IconSize icon_size,
       const content::URLDataSource::GotDataCallback& callback);
 
  private:
   // Contains the necessary information for completing an icon fetch request.
   struct IconRequestDetails {
     IconRequestDetails();
+    IconRequestDetails(const IconRequestDetails& other);
     ~IconRequestDetails();
 
     // The callback to run with the response.
     content::URLDataSource::GotDataCallback callback;
 
     // The requested scale factor to respond with.
     float scale_factor;
   };
 
   // Called when favicon data is available from the history backend.
   void OnFileIconDataAvailable(const IconRequestDetails& details,
                                gfx::Image* icon);
 
   // Tracks tasks requesting file icons.
   base::CancelableTaskTracker cancelable_task_tracker_;
 
   DISALLOW_COPY_AND_ASSIGN(FileIconSource);
 };
 #endif  // CHROME_BROWSER_UI_WEBUI_FILEICON_SOURCE_H_