Forward declare CT structs in ct_serialization.h

net/cert/ct_serialization_unittest.cc

 // Copyright 2013 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/cert/ct_serialization.h"
 
 #include <string>
 
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "net/base/test_completion_callback.h"
 #include "net/base/test_data_directory.h"
+#include "net/cert/signed_certificate_timestamp.h"
+#include "net/cert/signed_tree_head.h"
 #include "net/cert/x509_certificate.h"
 #include "net/log/net_log.h"
 #include "net/test/cert_test_util.h"
 #include "net/test/ct_test_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace net {
 
 class CtSerializationTest : public ::testing::Test {
  public:
@@ skipping 152 matching lines @@
   // Bytes 18-49 are sha256 root hash
   ASSERT_EQ(50u, encoded.length());
   std::string expected_buffer(
       "\x0\x1\x0\x0\x1\x45\x3c\x5f\xb8\x35\x0\x0\x0\x0\x0\x0\x0\x15", 18);
   expected_buffer.append(ct::GetSampleSTHSHA256RootHash());
   ASSERT_EQ(expected_buffer, encoded);
 }
 
 }  // namespace net