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

net/http/http_stream_parser_unittest.cc

 // 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.
 
 #include "net/http/http_stream_parser.h"
 
 #include "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/memory/ref_counted.h"
-#include "base/string_piece.h"
 #include "base/stringprintf.h"
+#include "base/strings/string_piece.h"
 #include "googleurl/src/gurl.h"
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
 #include "net/base/test_completion_callback.h"
 #include "net/base/upload_bytes_element_reader.h"
 #include "net/base/upload_data_stream.h"
 #include "net/base/upload_file_element_reader.h"
 #include "net/http/http_request_headers.h"
 #include "net/http/http_request_info.h"
 #include "net/http/http_response_info.h"
@@ skipping 272 matching lines @@
   rv = parser.ReadResponseBody(body_buffer, kBodySize, callback.callback());
   ASSERT_EQ(ERR_IO_PENDING, rv);
   data.RunFor(1);
 
   ASSERT_TRUE(callback.have_result());
   rv = callback.WaitForResult();
   ASSERT_EQ(kBodySize, rv);
 }
 
 }  // namespace net