[Sync] Introduce AttachmentStoreForSync class

sync/internal_api/public/attachments/in_memory_attachment_store.h

Index: sync/internal_api/public/attachments/in_memory_attachment_store.h
diff --git a/sync/internal_api/public/attachments/in_memory_attachment_store.h b/sync/internal_api/public/attachments/in_memory_attachment_store.h
index 5f8599258d3bf333392b954c8b8693e2696034d5..e51147414565b04aa3a7d463889a04bd9154e403 100644
--- a/sync/internal_api/public/attachments/in_memory_attachment_store.h
+++ b/sync/internal_api/public/attachments/in_memory_attachment_store.h
@@ -33,17 +33,19 @@ class SYNC_EXPORT InMemoryAttachmentStore : public AttachmentStoreBackend,
   void Init(const AttachmentStore::InitCallback& callback) override;
   void Read(const AttachmentIdList& ids,
             const AttachmentStore::ReadCallback& callback) override;
-  void Write(AttachmentStore::AttachmentReferrer referrer,
+  void Write(AttachmentStore::Component component,
              const AttachmentList& attachments,
              const AttachmentStore::WriteCallback& callback) override;
-  void Drop(AttachmentStore::AttachmentReferrer referrer,
-            const AttachmentIdList& ids,
-            const AttachmentStore::DropCallback& callback) override;
+  void SetReference(AttachmentStore::Component component,
+                    const AttachmentIdList& ids) override;
+  void DropReference(AttachmentStore::Component component,
+                     const AttachmentIdList& ids,
+                     const AttachmentStore::DropCallback& callback) override;
   void ReadMetadata(
       const AttachmentIdList& ids,
       const AttachmentStore::ReadMetadataCallback& callback) override;
   void ReadAllMetadata(
-      AttachmentStore::AttachmentReferrer referrer,
+      AttachmentStore::Component component,
       const AttachmentStore::ReadMetadataCallback& callback) override;
 
  private: