Add a test for ITunesDataProvider (try two).

chrome/browser/media_galleries/imported_media_gallery_registry.h

Index: chrome/browser/media_galleries/imported_media_gallery_registry.h
diff --git a/chrome/browser/media_galleries/imported_media_gallery_registry.h b/chrome/browser/media_galleries/imported_media_gallery_registry.h
index f90e7c1309e9d8f71a3afde6f7437b71dba4c4f8..b9bff981161f77d2a98a8df8f7ed121c14e3fac1 100644
--- a/chrome/browser/media_galleries/imported_media_gallery_registry.h
+++ b/chrome/browser/media_galleries/imported_media_gallery_registry.h
@@ -15,6 +15,7 @@
 
 namespace itunes {
 class ITunesDataProvider;
+class ITunesDataProviderTest;
 }
 
 namespace picasa {
@@ -49,6 +50,7 @@ class ImportedMediaGalleryRegistry {
 
  private:
   friend struct base::DefaultLazyInstanceTraits<ImportedMediaGalleryRegistry>;
+  friend class itunes::ITunesDataProviderTest;
 
   ImportedMediaGalleryRegistry();
   virtual ~ImportedMediaGalleryRegistry();