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

sync/internal_api/public/util/weak_handle.cc

-// 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.
-
-#include "sync/internal_api/public/util/weak_handle.h"
-
-#include <sstream>
-
-#include "base/callback.h"
-#include "base/location.h"
-#include "base/threading/thread_task_runner_handle.h"
-
-namespace syncer {
-
-namespace internal {
-
-WeakHandleCoreBase::WeakHandleCoreBase()
-    : owner_loop_task_runner_(base::ThreadTaskRunnerHandle::Get()) {}
-
-bool WeakHandleCoreBase::IsOnOwnerThread() const {
-  return owner_loop_task_runner_->BelongsToCurrentThread();
-}
-
-WeakHandleCoreBase::~WeakHandleCoreBase() {}
-
-void WeakHandleCoreBase::PostToOwnerThread(
-    const tracked_objects::Location& from_here,
-    const base::Closure& fn) const {
-  if (!owner_loop_task_runner_->PostTask(from_here, fn)) {
-    DVLOG(1) << "Could not post task from " << from_here.ToString();
-  }
-}
-
-}  // namespace internal
-
-}  // namespace syncer