Revert of Convert network hints to Mojo

tools/ipc_fuzzer/fuzzer/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 <iostream>
 #include <set>
 #include <string>
 #include <tuple>
 #include <utility>
 #include <vector>
@@ skipping 1474 matching lines @@
     if (!FuzzParam(&ip_address, fuzzer))
       return false;
     if (!FuzzParam(&port, fuzzer))
       return false;
     net::IPEndPoint ip_endpoint(ip_address, port);
     *p = ip_endpoint;
     return true;
   }
 };
 
+template <>
+struct FuzzTraits<network_hints::LookupRequest> {
+  static bool Fuzz(network_hints::LookupRequest* p, Fuzzer* fuzzer) {
+    if (!FuzzParam(&p->hostname_list, fuzzer))
+      return false;
+    return true;
+  }
+};
+
 // PP_ traits.
 template <>
 struct FuzzTraits<PP_Bool> {
   static bool Fuzz(PP_Bool* p, Fuzzer* fuzzer) {
     bool tmp = PP_ToBool(*p);
     if (!FuzzParam(&tmp, fuzzer))
       return false;
     *p = PP_FromBool(tmp);
     return true;
   }
@@ skipping 511 matching lines @@
 #include "tools/ipc_fuzzer/message_lib/all_message_null_macros.h"
 #undef IPC_MESSAGE_DECL
 #define IPC_MESSAGE_DECL(name, ...) \
   (*map)[static_cast<uint32_t>(name::ID)] = FuzzerHelper<name>::Fuzz;
 
 void PopulateFuzzerFunctionMap(FuzzerFunctionMap* map) {
 #include "tools/ipc_fuzzer/message_lib/all_messages.h"
 }
 
 }  // namespace ipc_fuzzer