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

mi_exe_stub/ptrdiff_t.h

-// Copyright 2006-2010 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.
-// ========================================================================
-//
-// The WDK CRT headers do not define ptrdiff_t, which is used by
-// scoped_array.
-
-#ifndef OMAHA_MI_EXE_STUB_PTRDIFF_H_
-#define OMAHA_MI_EXE_STUB_PTRDIFF_H_
-
-namespace std {
-
-#ifdef _WIN64
-typedef __intr64 ptrdiff_t;
-#else
-typedef int ptrdiff_t;
-#endif
-
-}  // namespace std
-
-#endif  // OMAHA_MI_EXE_STUB_PTRDIFF_H_