[wasm] Reduce usage of old Wasm.* API in JS tests.

test/mjsunit/wasm/instantiate-module-basic.js

Index: test/mjsunit/wasm/instantiate-module-basic.js
diff --git a/test/mjsunit/wasm/instantiate-module-basic.js b/test/mjsunit/wasm/instantiate-module-basic.js
index e3e0f4a441318b0b5231aafc57ec3d078d02e80f..632186a521d15c2e023f382a8c59658a9026c1fb 100644
--- a/test/mjsunit/wasm/instantiate-module-basic.js
+++ b/test/mjsunit/wasm/instantiate-module-basic.js
@@ -52,9 +52,6 @@ function CheckInstance(instance) {
   assertEquals(kReturnValue, main());
 }
 
-// Deprecated experimental API.
-CheckInstance(Wasm.instantiateModule(buffer));
-
 // Official API
 let module = new WebAssembly.Module(buffer);
 CheckInstance(new WebAssembly.Instance(module));