Revert old API handling

pkgs/test/lib/src/runner/browser/static/run_wasm_chrome.js

@@ -11,21 +11,11 @@
 
   // Instantiate the Dart module, importing from the global scope.
   let dart2wasmJsRuntime = await import('./' + data.jsruntimeurl);
+  let compiledModule = await dart2wasmJsRuntime.compileStreaming(fetch(data.wasmurl));
+  let instantiatedModule = await compiledModule.instantiate()
 
-  // Check whether the JS shim has the new instantiation API.
-  if (dart2wasmJsRuntime.CompiledApp !== undefined) {
-    // New API.
-    let compiledModule = await dart2wasmJsRuntime.compileStreaming(fetch(data.wasmurl));
-    let instantiatedModule = await compiledModule.instantiate()
-
-    // Call `main`. If tasks are placed into the event loop (by scheduling tasks
-    // explicitly or awaiting Futures), these will automatically keep the script
-    // alive even after `main` returns.
-    await instantiatedModule.invokeMain();
-  } else {
-    // Old, deprecated API.
-    let modulePromise = WebAssembly.compileStreaming(fetch(data.wasmurl));
-    let dartInstance = await dart2wasmJsRuntime.instantiate(modulePromise, {});
-    await dart2wasmJsRuntime.invoke(dartInstance);
-  }
+  // Call `main`. If tasks are placed into the event loop (by scheduling tasks
+  // explicitly or awaiting Futures), these will automatically keep the script
+  // alive even after `main` returns.
+  await instantiatedModule.invokeMain();
 })();