Revert 214254 "Add initial prototype for the GN meta-buildsystem."

trunk/src/tools/gn/item.cc

-// Copyright (c) 2013 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 "tools/gn/item.h"
-
-#include "base/logging.h"
-
-Item::Item(const Label& label) : label_(label) {
-}
-
-Item::~Item() {
-}
-
-Config* Item::AsConfig() { return NULL; }
-const Config* Item::AsConfig() const { return NULL; }
-Target* Item::AsTarget() { return NULL; }
-const Target* Item::AsTarget() const { return NULL; }
-Toolchain* Item::AsToolchain() { return NULL; }
-const Toolchain* Item::AsToolchain() const { return NULL; }
-
-std::string Item::GetItemTypeName() const {
-  if (AsConfig())
-    return "config";
-  if (AsTarget())
-    return "target";
-  if (AsToolchain())
-    return "toolchain";
-  NOTREACHED();
-  return "this thing that I have no idea what it is";
-}