[Sync] Move //sync to //components/sync.

components/sync/protocol/unique_position.proto

 // Copyright (c) 2012 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.
 //
 // Protobuf representation of the UniquePosition class.
 
 // Update proto_value_conversions{.h,.cc,_unittest.cc} if you change
 // any fields in this file.
 
 syntax = "proto2";
@@ skipping 53 matching lines @@
   optional bytes compressed_value = 2;
   optional uint64 uncompressed_length = 3;
 
   // This encoding uses compression scheme designed especially for unique
   // positions.  It has the property that X < Y precisely when Compressed(X) <
   // Compressed(Y), which is very useful when the most common operation is to
   // compare these positions against each other.  Their values may remain
   // compressed in memory.
   //
   // The compression scheme is implemented and documented in
-  // sync/internal_api/base/unique_position.cc.
+  // sync/core_impl/base/unique_position.cc.
   //
   // As of M30, this is the preferred encoding.  Newer clients may continue to
   // populate the 'value' and 'compressed_value' fields to ensure backwards
   // compatibility, but they will always try to read from this field first.
   optional bytes custom_compressed_v1 = 4;
 }