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

base/static_assert.h

-// Copyright 2004-2009 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.
-// ========================================================================
-//
-// static_assert.h
-//
-// Compile-time asserts
-//
-// Based on the one from boost:
-// http://www.boost.org/boost/static_assert.hpp
-//
-// Usage:
-//
-// kStaticAssert(constant_boolean_expression);
-//
-// This can appear at file scope or within a block (anyplace a typedef
-// is OK).
-//
-// TODO(omaha): deprecate and replace with the static assert in base/basictypes
-#ifndef OMAHA_COMMON_STATIC_ASSERT_H_
-#define OMAHA_COMMON_STATIC_ASSERT_H_
-
-template <bool> struct STATIC_ASSERTION_FAILURE;
-
-template <> struct STATIC_ASSERTION_FAILURE<true> { enum { value = 1 }; };
-
-template<int> struct static_assert_test{};
-
-#define STATIC_ASSERT( B ) \
-typedef static_assert_test<\
-  sizeof(STATIC_ASSERTION_FAILURE< (bool)( B ) >)>\
-    static_assert_typedef_ ##  __LINE__
-
-#endif  // OMAHA_COMMON_STATIC_ASSERT_H_