[BlobAsync] Asynchronous Blob Construction Final Patch

storage/browser/blob/blob_data_snapshot.h

Index: storage/browser/blob/blob_data_snapshot.h
diff --git a/storage/browser/blob/blob_data_snapshot.h b/storage/browser/blob/blob_data_snapshot.h
index 31b2973d4c14504e326d752725c8dfd60533253d..481629acea83e702aafa1e71717f54cf1f331485 100644
--- a/storage/browser/blob/blob_data_snapshot.h
+++ b/storage/browser/blob/blob_data_snapshot.h
@@ -44,6 +44,8 @@ class STORAGE_EXPORT BlobDataSnapshot : public base::SupportsUserData::Data {
  private:
   friend class BlobDataBuilder;
   friend class BlobStorageContext;
+  friend STORAGE_EXPORT void PrintTo(const BlobDataSnapshot& x,
+                                     ::std::ostream* os);
   BlobDataSnapshot(const std::string& uuid,
                    const std::string& content_type,
                    const std::string& content_disposition);