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

sync/protocol/extension_setting_specifics.proto

Index: sync/protocol/extension_setting_specifics.proto
diff --git a/sync/protocol/extension_setting_specifics.proto b/sync/protocol/extension_setting_specifics.proto
deleted file mode 100644
index 62947c50cbe51d366b3b70b3233767706204aeb2..0000000000000000000000000000000000000000
--- a/sync/protocol/extension_setting_specifics.proto
+++ /dev/null
@@ -1,28 +0,0 @@
-// 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.
-//
-// Sync protocol datatype extension for an extension setting.
-
-// Update proto_value_conversions{.h,.cc,_unittest.cc} if you change
-// any fields in this file.
-
-syntax = "proto2";
-
-option optimize_for = LITE_RUNTIME;
-option retain_unknown_fields = true;
-
-package sync_pb;
-
-// Properties of extension setting sync objects.
-message ExtensionSettingSpecifics {
-  // Id of the extension the setting is for.
-  optional string extension_id = 1;
-
-  // Setting key.
-  optional string key = 2;
-
-  // Setting value serialized as JSON.
-  optional string value = 3;
-}
-