Remove base/port.h includes that are not necessary anymore.

net/tools/balsa/string_piece_utils.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_STRING_PIECE_UTILS_H_
 #define NET_TOOLS_BALSA_STRING_PIECE_UTILS_H_
 
 #include <ctype.h>
 
-#include "base/port.h"
 #include "base/strings/string_piece.h"
 
 namespace net {
 
 #if defined(COMPILER_MSVC)
 struct StringPieceCaseCompare {
   static const size_t bucket_size = 4;
 
   size_t operator()(const base::StringPiece& sp) const {
     // based on __stl_string_hash in http://www.sgi.com/tech/stl/string
@@ skipping 82 matching lines @@
     return StringPieceUtils::EqualIgnoreCase(piece1, piece2);
   }
 };
 
 
 
 }  // namespace net
 
 #endif  // NET_TOOLS_BALSA_STRING_PIECE_UTILS_H_