Reland of Enable GN check for webrtc/base

webrtc/base/stringize_macros.h

Index: webrtc/base/stringize_macros.h
diff --git a/webrtc/system_wrappers/include/stringize_macros.h b/webrtc/base/stringize_macros.h
similarity index 86%
rename from webrtc/system_wrappers/include/stringize_macros.h
rename to webrtc/base/stringize_macros.h
index 9c8e7e9120ae2ff77447e91515c67f3e95927e34..7e2f44da8aeb0e307394b1c8f637b68bc871eef0 100644
--- a/webrtc/system_wrappers/include/stringize_macros.h
+++ b/webrtc/base/stringize_macros.h
@@ -15,8 +15,8 @@
 // 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_
+#ifndef WEBRTC_BASE_STRINGIZE_MACROS_H_
+#define WEBRTC_BASE_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
@@ -35,4 +35,4 @@
 //   STRINGIZE(B(y)) produces "myobj->FunctionCall(y)"
 #define STRINGIZE(x) STRINGIZE_NO_EXPANSION(x)
 
-#endif  // WEBRTC_SYSTEM_WRAPPERS_INCLUDE_STRINGIZE_MACROS_H_
+#endif  // WEBRTC_BASE_STRINGIZE_MACROS_H_