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

trunk/src/tools/gn/import_manager.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_IMPORT_MANAGER_H_
-#define TOOLS_GN_IMPORT_MANAGER_H_
-
-#include <map>
-
-#include "base/synchronization/lock.h"
-
-class Err;
-class ParseNode;
-class Scope;
-class SourceFile;
-
-// Provides a cache of the results of importing scopes so the results can
-// be re-used rather than running the imported files multiple times.
-class ImportManager {
- public:
-  ImportManager();
-  ~ImportManager();
-
-  // Does an import of the given file into the given scope. On error, sets the
-  // error and returns false.
-  bool DoImport(const SourceFile& file,
-                const ParseNode* node_for_err,
-                Scope* scope,
-                Err* err);
-
- private:
-  base::Lock lock_;
-
-  // Owning pointers to the scopes.
-  typedef std::map<SourceFile, const Scope*> ImportMap;
-  ImportMap imports_;
-
-  DISALLOW_COPY_AND_ASSIGN(ImportManager);
-};
-
-#endif  // TOOLS_GN_IMPORT_MANAGER_H_