net: Update the include paths of base/string_piece.h to its new location.

net/tools/flip_server/string_piece_utils.h

 // Copyright (c) 2010 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_FLIP_SERVER_STRING_PIECE_UTILS_H_
 #define NET_TOOLS_FLIP_SERVER_STRING_PIECE_UTILS_H_
 
 #include <ctype.h>
 
 #include "base/port.h"
-#include "base/string_piece.h"
+#include "base/strings/string_piece.h"
 
 namespace net {
 
 struct StringPieceCaseHash {
   size_t operator()(const base::StringPiece& sp) const {
     // based on __stl_string_hash in http://www.sgi.com/tech/stl/string
     size_t hash_val = 0;
     for (base::StringPiece::const_iterator it = sp.begin();
          it != sp.end(); ++it) {
       hash_val = 5 * hash_val + tolower(*it);
@@ skipping 50 matching lines @@
     return StringPieceUtils::EqualIgnoreCase(piece1, piece2);
   }
 };
 
 
 
 }  // namespace net
 
 #endif  // NET_TOOLS_FLIP_SERVER_STRING_PIECE_UTILS_H_