Add a test for ITunesDataProvider (try two).

chrome/browser/media_galleries/imported_media_gallery_registry.h

 // Copyright 2013 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_IMPORTED_MEDIA_GALLERY_REGISTRY_H_
 #define CHROME_BROWSER_MEDIA_GALLERIES_IMPORTED_MEDIA_GALLERY_REGISTRY_H_
 
 #include <set>
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/files/file_path.h"
 #include "base/lazy_instance.h"
 #include "base/memory/scoped_ptr.h"
 
 namespace itunes {
 class ITunesDataProvider;
+class ITunesDataProviderTest;
 }
 
 namespace picasa {
 class PicasaDataProvider;
 }
 
 namespace chrome {
 
 // This class lives on the MediaTaskRunner thread. It has some static
 // methods which are called on the UI thread.
@@ skipping 14 matching lines @@
   bool RevokeImportedFilesystemOnUIThread(const std::string& fsid);
 
   // Should be called on the MediaTaskRunner thread only.
 #if defined(OS_WIN) || defined(OS_MACOSX)
   static picasa::PicasaDataProvider* PicasaDataProvider();
   static itunes::ITunesDataProvider* ITunesDataProvider();
 #endif  // defined(OS_WIN) || defined(OS_MACOSX)
 
  private:
   friend struct base::DefaultLazyInstanceTraits<ImportedMediaGalleryRegistry>;
+  friend class itunes::ITunesDataProviderTest;
 
   ImportedMediaGalleryRegistry();
   virtual ~ImportedMediaGalleryRegistry();
 
 #if defined(OS_WIN) || defined(OS_MACOSX)
   void RegisterPicasaFileSystem(const base::FilePath& database_path);
   void RevokePicasaFileSystem();
 
   void RegisterITunesFileSystem(const base::FilePath& xml_library_path);
   void RevokeITunesFileSystem();
@@ skipping 11 matching lines @@
   base::FilePath itunes_xml_library_path_;
 #endif
 #endif  // defined(OS_WIN) || defined(OS_MACOSX)
 
   DISALLOW_COPY_AND_ASSIGN(ImportedMediaGalleryRegistry);
 };
 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_MEDIA_GALLERIES_IMPORTED_MEDIA_GALLERY_REGISTRY_H_