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

net/http/http_stream_parser.h

 // Copyright (c) 2012 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_HTTP_HTTP_STREAM_PARSER_H_
 #define NET_HTTP_HTTP_STREAM_PARSER_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
-#include "base/string_piece.h"
+#include "base/strings/string_piece.h"
 #include "net/base/completion_callback.h"
 #include "net/base/net_export.h"
 #include "net/base/net_log.h"
 #include "net/base/upload_progress.h"
 
 namespace net {
 
 class ClientSocketHandle;
 class DrainableIOBuffer;
 class GrowableIOBuffer;
@@ skipping 204 matching lines @@
   bool sent_last_chunk_;
 
   base::WeakPtrFactory<HttpStreamParser> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(HttpStreamParser);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_STREAM_PARSER_H_