[Sync] Add size and crc32c to AttachmentId.

sync/api/attachments/attachment_unittest.cc

 // 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.
 
 #include "sync/api/attachments/attachment.h"
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/ref_counted_memory.h"
@@ skipping 20 matching lines @@
   EXPECT_EQ(a1.GetData(), a2.GetData());
 }
 
 TEST_F(AttachmentTest, Create_WithEmptyData) {
   scoped_refptr<base::RefCountedString> empty_data(new base::RefCountedString);
   Attachment a = Attachment::Create(empty_data);
   EXPECT_EQ(empty_data, a.GetData());
 }
 
 TEST_F(AttachmentTest, CreateFromParts_HappyCase) {
-  AttachmentId id = AttachmentId::Create();
   scoped_refptr<base::RefCountedString> some_data(new base::RefCountedString);
   some_data->data() = kAttachmentData;
   uint32_t crc32c = ComputeCrc32c(some_data);
-  Attachment a = Attachment::CreateFromParts(id, some_data, crc32c);
+  AttachmentId id = AttachmentId::Create(some_data->size(), crc32c);
+  Attachment a = Attachment::CreateFromParts(id, some_data);
   EXPECT_EQ(id, a.GetId());
   EXPECT_EQ(some_data, a.GetData());
 }
 
 }  // namespace syncer