Reland of Enable GN check for webrtc/base

webrtc/system_wrappers/include/stringize_macros.h

Index: webrtc/system_wrappers/include/stringize_macros.h
diff --git a/webrtc/system_wrappers/include/stringize_macros.h b/webrtc/system_wrappers/include/stringize_macros.h
deleted file mode 100644
index 9c8e7e9120ae2ff77447e91515c67f3e95927e34..0000000000000000000000000000000000000000
--- a/webrtc/system_wrappers/include/stringize_macros.h
+++ /dev/null
@@ -1,38 +0,0 @@
-/*
- *  Copyright (c) 2013 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.
- */
-
-// Modified from the Chromium original:
-// src/base/strings/stringize_macros.h
-
-// This file defines preprocessor macros for stringizing preprocessor
-// symbols (or their output) and manipulating preprocessor symbols
-// that define strings.
-
-#ifndef WEBRTC_SYSTEM_WRAPPERS_INCLUDE_STRINGIZE_MACROS_H_
-#define WEBRTC_SYSTEM_WRAPPERS_INCLUDE_STRINGIZE_MACROS_H_
-
-// This is not very useful as it does not expand defined symbols if
-// called directly. Use its counterpart without the _NO_EXPANSION
-// suffix, below.
-#define STRINGIZE_NO_EXPANSION(x) #x
-
-// Use this to quote the provided parameter, first expanding it if it
-// is a preprocessor symbol.
-//
-// For example, if:
-//   #define A FOO
-//   #define B(x) myobj->FunctionCall(x)
-//
-// Then:
-//   STRINGIZE(A) produces "FOO"
-//   STRINGIZE(B(y)) produces "myobj->FunctionCall(y)"
-#define STRINGIZE(x) STRINGIZE_NO_EXPANSION(x)
-
-#endif  // WEBRTC_SYSTEM_WRAPPERS_INCLUDE_STRINGIZE_MACROS_H_