Update Module::Instantiate to Maybe<bool> API

R=neis@chromium.org,gsathya@chromium.org

Change-Id: Ia547dff4600ccb4618e791528a784771f05cb038
Reviewed-on: https://chromium-review.googlesource.com/518104
Commit-Queue: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#475872}

third_party/WebKit/Source/bindings/core/v8/ScriptModule.cpp

@@ -68,9 +68,11 @@ ScriptValue ScriptModule::Instantiate(ScriptState* script_state) {
 
   DCHECK(!IsNull());
   v8::Local<v8::Context> context = script_state->GetContext();
-  bool success = NewLocal(script_state->GetIsolate())
-                     ->Instantiate(context, &ResolveModuleCallback);
-  if (!success) {
+  bool success;
+  if (!NewLocal(script_state->GetIsolate())
+           ->InstantiateModule(context, &ResolveModuleCallback)
+           .To(&success) ||
+      !success) {
     DCHECK(try_catch.HasCaught());
     return ScriptValue(script_state, try_catch.Exception());
   }