Implement Instance instances correctly; fix a few error cases

test/common/wasm/wasm-module-runner.cc

Index: test/common/wasm/wasm-module-runner.cc
diff --git a/test/common/wasm/wasm-module-runner.cc b/test/common/wasm/wasm-module-runner.cc
index d099e01bf1fe04b90f90f7932e3b6b06b3fb6ce4..0432caf7049ad51a61cdc46acd66be173465b98f 100644
--- a/test/common/wasm/wasm-module-runner.cc
+++ b/test/common/wasm/wasm-module-runner.cc
@@ -205,9 +205,7 @@ int32_t CallWasmFunctionForTesting(Isolate* isolate, Handle<JSObject> instance,
 }
 
 void SetupIsolateForWasmModule(Isolate* isolate) {
-  WasmJs::InstallWasmMapsIfNeeded(isolate, isolate->native_context());
-  WasmJs::InstallWasmModuleSymbolIfNeeded(isolate, isolate->global_object(),
-                                          isolate->native_context());
+  WasmJs::Install(isolate);
 }
 }  // namespace testing
 }  // namespace wasm