Remove //mojo/tools/package_manager.

mojo/tools/package_manager/unpacker.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 "mojo/tools/package_manager/unpacker.h"
-
-#include "base/files/file_util.h"
-#include "base/logging.h"
-#include "third_party/zlib/google/zip.h"
-
-namespace mojo {
-
-Unpacker::Unpacker() {
-}
-
-Unpacker::~Unpacker() {
-  if (!dir_.empty())
-    DeleteFile(dir_, true);
-}
-
-bool Unpacker::Unpack(const base::FilePath& zip_file) {
-  DCHECK(zip_file_.empty());
-  zip_file_ = zip_file;
-
-  DCHECK(dir_.empty());
-  if (!CreateNewTempDirectory(base::FilePath::StringType(), &dir_))
-    return false;
-  if (!zip::Unzip(zip_file, dir_)) {
-    dir_ = base::FilePath();
-    return false;
-  }
-  return true;
-}
-
-}  // namespace mojo