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

sync/protocol/extension_specifics.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.
-//
-// Sync protocol datatype extension for extensions.
-
-// 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 sync objects.
-//
-// Merge policy: the settings for the higher version number win; in
-// the case of a tie, server wins.
-message ExtensionSpecifics {
-  // Globally unique id for this extension.
-  optional string id = 1;
-  // The known installed version.
-  optional string version = 2;
-
-  // Auto-update URL to use for this extension.  May be blank, in
-  // which case the default one (i.e., the one for the Chrome
-  // Extensions Gallery) is used.
-  optional string update_url = 3;
-  // Whether or not this extension is enabled.
-  optional bool enabled = 4;
-  // Whether or not this extension is enabled in incognito mode.
-  optional bool incognito_enabled = 5;
-
-  // The name of the extension. Used for bookmark apps.
-  optional string name = 6;
-
-  // Whether this extension was installed remotely, and hasn't been approved by
-  // a user in chrome yet.
-  optional bool remote_install = 7;
-
-  // Whether this extension was installed by the custodian of a supervised user.
-  optional bool installed_by_custodian = 8;
-
-  // Whether this extension has explicit user consent access to all urls.
-  // This is a tri-state boolean, so, unlike most fields here, it really *is*
-  // optional and may be absent. We need this for the time being because we need
-  // to know if a user has not set an explicit preference.
-  optional bool all_urls_enabled = 9;
-
-  // Bitmask of the set of reasons why the extension is disabled (see
-  // Extension::DisableReason). Only relevant when enabled == false. Note that
-  // old clients (<M45) won't set this, even when enabled is false.
-  optional int32 disable_reasons = 10;
-}
-