[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 7b2f3bd28dae9e2763f12f6788c2b248cf22c695..d2218400c6795a881b1e8b92588af9011da4877c 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) {