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

trunk/src/tools/gn/item.h

-// 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.
-
-#ifndef TOOLS_GN_ITEM_H_
-#define TOOLS_GN_ITEM_H_
-
-#include <string>
-
-#include "tools/gn/label.h"
-
-class Config;
-class Target;
-class Toolchain;
-
-// A named item (target, config, etc.) that participates in the dependency
-// graph.
-class Item {
- public:
-  Item(const Label& label);
-  virtual ~Item();
-
-  const Label& label() const { return label_; }
-
-  // Manual RTTI.
-  virtual Config* AsConfig();
-  virtual const Config* AsConfig() const;
-  virtual Target* AsTarget();
-  virtual const Target* AsTarget() const;
-  virtual Toolchain* AsToolchain();
-  virtual const Toolchain* AsToolchain() const;
-
-  // Returns a name like "target" or "config" for the type of item this is, to
-  // be used in logging and error messages.
-  std::string GetItemTypeName() const;
-
-  // Called when this item is resolved, meaning it and all of its dependents
-  // have no unresolved deps.
-  virtual void OnResolved() {}
-
- private:
-  Label label_;
-};
-
-#endif  // TOOLS_GN_ITEM_H_