Implement Instance instances correctly; fix a few error cases

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

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "test/common/wasm/wasm-module-runner.h"
 
 #include "src/handles.h"
 #include "src/isolate.h"
 #include "src/objects.h"
 #include "src/property-descriptor.h"
@@ skipping 187 matching lines @@
   }
   if (result->IsHeapNumber()) {
     return static_cast<int32_t>(HeapNumber::cast(*result)->value());
   }
   thrower->RuntimeError(
       "WASM.compileRun() failed: Return value should be number");
   return -1;
 }
 
 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
 }  // namespace internal
 }  // namespace v8