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

testing/libfuzzer/fuzzers/websocket_frame_parser_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/websockets/websocket_frame_parser.h"
-
-// Entry point for LibFuzzer.
-extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
-  net::WebSocketFrameParser parser;
-  std::vector<scoped_ptr<net::WebSocketFrameChunk>> frame_chunks;
-  parser.Decode(reinterpret_cast<const char*>(data), size, &frame_chunks);
-
-  return 0;
-}