Revert of [Sync] Add size and crc32c to AttachmentId.

sync/internal_api/public/attachments/attachment_downloader_impl.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 SYNC_INTERNAL_API_PUBLIC_ATTACHMENTS_ATTACHMENT_DOWNLOADER_IMPL_H_
 #define SYNC_INTERNAL_API_PUBLIC_ATTACHMENTS_ATTACHMENT_DOWNLOADER_IMPL_H_
 
 #include "base/containers/scoped_ptr_hash_map.h"
 #include "base/threading/non_thread_safe.h"
 #include "google_apis/gaia/oauth2_token_service_request.h"
@@ skipping 70 matching lines @@
   typedef std::string AttachmentUrl;
   typedef base::ScopedPtrHashMap<AttachmentUrl, DownloadState> StateMap;
   typedef std::vector<DownloadState*> StateList;
 
   scoped_ptr<net::URLFetcher> CreateFetcher(const AttachmentUrl& url,
                                             const std::string& access_token);
   void RequestAccessToken(DownloadState* download_state);
   void ReportResult(
       const DownloadState& download_state,
       const DownloadResult& result,
-      const scoped_refptr<base::RefCountedString>& attachment_data);
+      const scoped_refptr<base::RefCountedString>& attachment_data,
+      uint32_t attachment_crc32c);
 
   // Extract the crc32c from an X-Goog-Hash header in |headers|.
   //
   // Return true if a crc32c was found and useable for checking data integrity.
   // "Usable" means headers are present, there is "x-goog-hash" header with
   // "crc32c" hash in it, this hash is correctly base64 encoded 32 bit integer.
   SYNC_EXPORT_PRIVATE static bool ExtractCrc32c(
       const net::HttpResponseHeaders* headers,
       uint32_t* crc32c);
 
@@ skipping 14 matching lines @@
   StateList requests_waiting_for_access_token_;
 
   ModelType model_type_;
 
   DISALLOW_COPY_AND_ASSIGN(AttachmentDownloaderImpl);
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_INTERNAL_API_PUBLIC_ATTACHMENTS_ATTACHMENT_DOWNLOADER_IMPL_H_