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

chrome/browser/media_galleries/media_scan_manager.h

 // Copyright 2014 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_MEDIA_GALLERIES_MEDIA_SCAN_MANAGER_H_
 #define CHROME_BROWSER_MEDIA_GALLERIES_MEDIA_SCAN_MANAGER_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 51 matching lines @@
   void SetMediaFolderFinderFactory(const MediaFolderFinderFactory& factory);
 
   // Here so that friend MediaScanManagerTest can access it.
   static MediaFolderFinder::MediaFolderFinderResults FindContainerScanResults(
       const MediaFolderFinder::MediaFolderFinderResults& found_folders,
       const std::vector<base::FilePath>& sensitive_locations);
 
  private:
   struct ScanObservers {
     ScanObservers();
+    ScanObservers(const ScanObservers& other);
     ~ScanObservers();
     MediaScanManagerObserver* observer;
     std::set<std::string /*extension id*/> scanning_extensions;
   };
   typedef std::map<Profile*, ScanObservers> ScanObserverMap;
 
   // extensions::ExtensionRegistryObserver implementation.
   void OnExtensionUnloaded(
       content::BrowserContext* browser_context,
       const extensions::Extension* extension,
@@ skipping 22 matching lines @@
   ScopedObserver<extensions::ExtensionRegistry,
                  extensions::ExtensionRegistryObserver>
       scoped_extension_registry_observer_;
 
   base::WeakPtrFactory<MediaScanManager> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaScanManager);
 };
 
 #endif  // CHROME_BROWSER_MEDIA_GALLERIES_MEDIA_SCAN_MANAGER_H_