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

net/spdy/spdy_stream_test_util.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_SPDY_SPDY_STREAM_TEST_UTIL_H_
 #define NET_SPDY_SPDY_STREAM_TEST_UTIL_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
-#include "base/string_piece.h"
+#include "base/strings/string_piece.h"
 #include "net/base/io_buffer.h"
 #include "net/base/test_completion_callback.h"
 #include "net/spdy/spdy_stream.h"
 
 namespace net {
 
 namespace test {
 
 // Delegate that calls Close() on |stream_| on OnClose. Used by tests
 // to make sure that such an action is harmless.
@@ skipping 94 matching lines @@
  private:
   scoped_refptr<DrainableIOBuffer> buf_;
   int body_data_sent_;
 };
 
 } // namespace test
 
 } // namespace net
 
 #endif // NET_SPDY_SPDY_STREAM_TEST_UTIL_H_