Mojo: Report bindings validation errors via MojoNotifyBadMessage

mojo/public/cpp/bindings/tests/sample_service_unittest.cc

Index: mojo/public/cpp/bindings/tests/sample_service_unittest.cc
diff --git a/mojo/public/cpp/bindings/tests/sample_service_unittest.cc b/mojo/public/cpp/bindings/tests/sample_service_unittest.cc
index 609a1dd18b5b88fea4bce551c95315575f805770..85436008e9ad69f2950e049b44052d293fd2b2b9 100644
--- a/mojo/public/cpp/bindings/tests/sample_service_unittest.cc
+++ b/mojo/public/cpp/bindings/tests/sample_service_unittest.cc
@@ -291,7 +291,7 @@ class ServiceProxyImpl : public ServiceProxy {
 
 class SimpleMessageReceiver : public mojo::MessageReceiverWithResponder {
  public:
-  bool Accept(mojo::Message* message) override {
+  Result Accept(mojo::Message* message) override {
     // Imagine some IPC happened here.
 
     if (g_dump_message_as_hex) {
@@ -308,9 +308,9 @@ class SimpleMessageReceiver : public mojo::MessageReceiverWithResponder {
     return stub.Accept(message);
   }
 
-  bool AcceptWithResponder(mojo::Message* message,
-                           mojo::MessageReceiver* responder) override {
-    return false;
+  Result AcceptWithResponder(mojo::Message* message,
+                             mojo::MessageReceiver* responder) override {
+    return Result::ForUnknownError();
   }
 };