Moving compile_assert_c.h to webrtc/base

webrtc/system_wrappers/include/compile_assert_c.h

-/*
- *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#ifndef WEBRTC_SYSTEM_WRAPPERS_INCLUDE_COMPILE_ASSERT_H_
-#define WEBRTC_SYSTEM_WRAPPERS_INCLUDE_COMPILE_ASSERT_H_
-
-// Use this macro to verify at compile time that certain restrictions are met.
-// The argument is the boolean expression to evaluate.
-// Example:
-//   RTC_COMPILE_ASSERT(sizeof(foo) < 128);
-// Note: In C++, use static_assert instead!
-#define RTC_COMPILE_ASSERT(expression) switch (0) {case 0: case expression:;}
-
-#endif  // WEBRTC_SYSTEM_WRAPPERS_INCLUDE_COMPILE_ASSERT_H_