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

net/dns/dns_query.h

 // Copyright (c) 2011 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_DNS_DNS_QUERY_H_
 #define NET_DNS_DNS_QUERY_H_
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
-#include "base/string_piece.h"
+#include "base/strings/string_piece.h"
 #include "net/base/net_export.h"
 
 namespace net {
 
 class IOBufferWithSize;
 
 // Represents on-the-wire DNS query message as an object.
 // TODO(szym): add support for the OPT pseudo-RR (EDNS0/DNSSEC).
 class NET_EXPORT_PRIVATE DnsQuery {
  public:
@@ skipping 26 matching lines @@
 
   // Contains query bytes to be consumed by higher level Write() call.
   scoped_refptr<IOBufferWithSize> io_buffer_;
 
   DISALLOW_COPY_AND_ASSIGN(DnsQuery);
 };
 
 }  // namespace net
 
 #endif  // NET_DNS_DNS_QUERY_H_