[wasm] Use a Managed<WasmModule> to hold metadata about modules.

test/fuzzer/wasm-code.cc

Index: test/fuzzer/wasm-code.cc
diff --git a/test/fuzzer/wasm-code.cc b/test/fuzzer/wasm-code.cc
index 5f310f06578d60cbe8c92f76eddba9d6c5385bab..5a8261685a904976aeddc66f6d03c2b75ce4915e 100644
--- a/test/fuzzer/wasm-code.cc
+++ b/test/fuzzer/wasm-code.cc
@@ -56,7 +56,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
 
   ErrorThrower interpreter_thrower(i_isolate, "Interpreter");
   std::unique_ptr<const WasmModule> module(testing::DecodeWasmModuleForTesting(
-      i_isolate, &zone, &interpreter_thrower, buffer.begin(), buffer.end(),
+      i_isolate, &interpreter_thrower, buffer.begin(), buffer.end(),
       v8::internal::wasm::ModuleOrigin::kWasmOrigin));
 
   if (module == nullptr) {