Port net/tools/balsa to non-Linux platforms.

net/tools/balsa/balsa_enums.h

 // Copyright 2013 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 NET_TOOLS_BALSA_BALSA_ENUMS_H_
 #define NET_TOOLS_BALSA_BALSA_ENUMS_H_
 
 namespace net {
 
 struct BalsaFrameEnums {
   enum ParseState {
     PARSE_ERROR,
     READING_HEADER_AND_FIRSTLINE,
     READING_CHUNK_LENGTH,
     READING_CHUNK_EXTENSION,
     READING_CHUNK_DATA,
     READING_CHUNK_TERM,
     READING_LAST_CHUNK_TERM,
     READING_TRAILER,
     READING_UNTIL_CLOSE,
     READING_CONTENT,
     MESSAGE_FULLY_READ,
     NUM_STATES,
   };
 
   enum ErrorCode {
+#if defined(_WIN32)
+    // On Windows, <WinError.h> defines the NO_ERROR macro as 0L, which
+    // breaks the compilation of the "NO_ERROR = 0" line.
+#undef NO_ERROR
+#endif
     NO_ERROR = 0,  // A sentinel value for convenience, none of the callbacks
     //                should ever see this error code.
     // Header parsing errors
     // Note that adding one to many of the REQUEST errors yields the
     // appropriate RESPONSE error.
     // Particularly, when parsing the first line of a request or response,
     // there are three sequences of non-whitespace regardless of whether or
     // not it is a request or response. These are listed below, in order.
     //
     //        firstline_a     firstline_b    firstline_c
@@ skipping 65 matching lines @@
     CONTENT_LENGTH_OVERFLOW,
     NO_CONTENT_LENGTH,
     VALID_CONTENT_LENGTH,
   };
 };
 
 }  // namespace net
 
 #endif  // NET_TOOLS_BALSA_BALSA_ENUMS_H_