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

net/base/unescape_url_component_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 <string>
 
 #include "net/base/escape.h"
 
 static const int kMaxUnescapeRule = 31;
 
 // Entry point for LibFuzzer.
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
   std::string path(reinterpret_cast<const char*>(data), size);
   for (int i = 0; i <= kMaxUnescapeRule; i++) {
     (void)net::UnescapeURLComponent(path,
                                     static_cast<net::UnescapeRule::Type>(i));
   }
   return 0;
 }