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

sync/internal_api/attachments/attachment_store_test_template.h

Index: sync/internal_api/attachments/attachment_store_test_template.h
diff --git a/sync/internal_api/attachments/attachment_store_test_template.h b/sync/internal_api/attachments/attachment_store_test_template.h
index 6292b012d7ce01c96ddc0ac830a91169711406aa..0d14ca542155fecead3bb02f71dbe531c313771b 100644
--- a/sync/internal_api/attachments/attachment_store_test_template.h
+++ b/sync/internal_api/attachments/attachment_store_test_template.h
@@ -133,8 +133,9 @@
 TYPED_TEST_P(AttachmentStoreTest, Write_NoOverwriteNoError) {
   // Create two attachments with the same id but different data.
   Attachment attachment1 = Attachment::Create(this->some_data1);
-  Attachment attachment2 =
-      Attachment::CreateFromParts(attachment1.GetId(), this->some_data2);
+  uint32_t crc32c = ComputeCrc32c(this->some_data2);
+  Attachment attachment2 = Attachment::CreateFromParts(
+      attachment1.GetId(), this->some_data2, crc32c);
 
   // Write the first one.
   AttachmentList some_attachments;