Move network fuzzers from //testing/libfuzzer/fuzzers to //net

testing/libfuzzer/fuzzers/http_chunked_decoder_fuzzer.cc

-// Copyright 2015 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 <stddef.h>
-#include <stdint.h>
-
-#include <vector>
-
-#include "net/http/http_chunked_decoder.h"
-
-// Entry point for LibFuzzer.
-extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
-  const char* data_ptr = reinterpret_cast<const char*>(data);
-  std::vector<char> buffer(data_ptr, data_ptr + size);
-  net::HttpChunkedDecoder decoder;
-  decoder.FilterBuf(buffer.data(), buffer.size());
-
-  return 0;
-}