Keep only base/extractor.[cc|h].

base/scoped_current_directory.h

-// Copyright 2005-2009 Google Inc.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-// ========================================================================
-
-#ifndef OMAHA_COMMON_SCOPED_CURRENT_DIRECTORY_H_
-#define OMAHA_COMMON_SCOPED_CURRENT_DIRECTORY_H_
-
-namespace omaha {
-
-// Utility class to "scope" the setting of a current directory, and restore
-// to the previous current directory when leaving the scope.  Handles the
-// case where we don't actually have a new current directory to switch to
-// (thus the parameter is the empty string).
-
-class scoped_current_directory {
-  public:
-    explicit scoped_current_directory(const TCHAR* new_directory) {
-      *was_directory_ = _T('\0');
-      if (new_directory && *new_directory) {
-        ::GetCurrentDirectory(arraysize(was_directory_), was_directory_);
-        ::SetCurrentDirectory(new_directory);
-      }
-    }
-    ~scoped_current_directory() {
-      if (*was_directory_) {
-        ::SetCurrentDirectory(was_directory_);
-      }
-    }
-  private:
-    TCHAR was_directory_[MAX_PATH];
-};
-
-}  // namespace omaha
-
-#endif // OMAHA_COMMON_SCOPED_CURRENT_DIRECTORY_H_