[Sync] Renaming sync/api* to sync/model*.

components/sync/api/attachments/attachment_metadata_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 "components/sync/api/attachments/attachment_metadata.h"
-
-#include <stdint.h>
-
-#include "testing/gtest/include/gtest/gtest.h"
-
-namespace syncer {
-
-class AttachmentMetadataTest : public testing::Test {};
-
-TEST_F(AttachmentMetadataTest, Create) {
-  size_t size = 42;
-  uint32_t crc32c = 2349829;
-  AttachmentId id = AttachmentId::Create(size, crc32c);
-  AttachmentMetadata metadata(id, size);
-  EXPECT_EQ(metadata.GetId(), id);
-  EXPECT_EQ(metadata.GetSize(), size);
-}
-
-}  // namespace syncer