Add build_config_functions.h to avoid #ifdef

sandbox/linux/tests/unit_tests.h

 // Copyright (c) 2012 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 SANDBOX_LINUX_TESTS_UNIT_TESTS_H__
 #define SANDBOX_LINUX_TESTS_UNIT_TESTS_H__
 
 #include "base/basictypes.h"
 #include "build/build_config.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace sandbox {
 
-// Has this been compiled to run on Android?
-bool IsAndroid();
-
-bool IsArchitectureArm();
-
 // Is Valgrind currently being used?
 bool IsRunningOnValgrind();
 
 #if defined(THREAD_SANITIZER)
 #define DISABLE_ON_TSAN(test_name) DISABLED_##test_name
 #else
 #define DISABLE_ON_TSAN(test_name) test_name
 #endif  // defined(THREAD_SANITIZER)
 
 // While it is perfectly OK for a complex test to provide its own DeathCheck
@@ skipping 97 matching lines @@
                             const std::string& msg,
                             const void* aux);
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(UnitTests);
 };
 
 }  // namespace
 
 #endif  // SANDBOX_LINUX_TESTS_UNIT_TESTS_H__