Revert of Convert network hints to Mojo

tools/ipc_fuzzer/fuzzer/fuzzer.cc

Index: tools/ipc_fuzzer/fuzzer/fuzzer.cc
diff --git a/tools/ipc_fuzzer/fuzzer/fuzzer.cc b/tools/ipc_fuzzer/fuzzer/fuzzer.cc
index f793bf561959c89253b4388b8e3a54b3f62b0b52..ff57074b382d72b450df5a52f461ea0d4998504e 100644
--- a/tools/ipc_fuzzer/fuzzer/fuzzer.cc
+++ b/tools/ipc_fuzzer/fuzzer/fuzzer.cc
@@ -1492,6 +1492,15 @@
   }
 };
 
+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> {