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

third_party/gtest/build.scons

-#!/usr/bin/python2.4
-#
-# Copyright 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.
-# ========================================================================
-
-Import('env')
-
-gtest_env = env.Clone()
-gtest_env.Append(
-    CPPPATH = [
-        '$MAIN_DIR/third_party/gtest/include',
-        '$MAIN_DIR/third_party/gtest',
-        ],
-    CCFLAGS = [
-        '/wd4061',  # enumerator in switch is not handled by a case label
-        '/wd4100',  # unreferenced formal parameter
-        '/wd4640',  # construction of local static object is not thread-safe
-        '/wd4505',  # unreferenced local function has been removed
-        '/wd4548',  # expression before comma has no effect
-        ],
-    CPPDEFINES = [
-        '_CRT_NONSTDC_NO_DEPRECATE',
-        ],
-)
-
-target_name = 'gtest'
-
-gtest_inputs = [ 'src/gtest-all.cc' ]
-if env.Bit('use_precompiled_headers'):
-  gtest_inputs += gtest_env.EnablePrecompile(target_name)
-
-gtest_env.ComponentLibrary(
-    lib_name=target_name,
-    source=gtest_inputs,
-)
-