Add the Mojo implementation of authenticator.mojom's MakeCredential.

third_party/WebKit/Source/modules/webauth/WebAuthentication.h

Index: third_party/WebKit/Source/modules/webauth/WebAuthentication.h
diff --git a/third_party/WebKit/Source/modules/webauth/WebAuthentication.h b/third_party/WebKit/Source/modules/webauth/WebAuthentication.h
index 262bc8b8c53479c13975471ce8f653873244035f..92ce08b60fcf93c08897d0afb54cc4dc6e272881 100644
--- a/third_party/WebKit/Source/modules/webauth/WebAuthentication.h
+++ b/third_party/WebKit/Source/modules/webauth/WebAuthentication.h
@@ -38,8 +38,6 @@ class WebAuthentication final
 
   virtual ~WebAuthentication();
 
-  void Dispose();
-
   // WebAuthentication.idl
   ScriptPromise makeCredential(ScriptState*,
                                const RelyingPartyAccount&,
@@ -50,24 +48,26 @@ class WebAuthentication final
                              const BufferSource&,
                              const AuthenticationAssertionOptions&);
 
-  // ContextLifecycleObserver overrides.
-  void ContextDestroyed(ExecutionContext*) override;
-
   webauth::mojom::blink::Authenticator* Authenticator() const {
     return authenticator_.get();
   }
 
-  void OnMakeCredential(ScriptPromiseResolver*,
-                        Vector<webauth::mojom::blink::ScopedCredentialInfoPtr>);
-  bool MarkRequestComplete(ScriptPromiseResolver*);
-
-  void OnAuthenticatorConnectionError();
+  // ContextLifecycleObserver overrides.
+  void ContextDestroyed(ExecutionContext*) override;
 
   DECLARE_VIRTUAL_TRACE();
 
  private:
   explicit WebAuthentication(LocalFrame&);
 
+  void OnMakeCredential(ScriptPromiseResolver*,
+                        webauth::mojom::blink::AuthenticatorStatus,
+                        webauth::mojom::blink::ScopedCredentialInfoPtr);
+  ScriptPromise RejectIfNotSupported(ScriptState*);
+  void OnAuthenticatorConnectionError();
+  bool MarkRequestComplete(ScriptPromiseResolver*);
+  void Cleanup();
+
   webauth::mojom::blink::AuthenticatorPtr authenticator_;
   HeapHashSet<Member<ScriptPromiseResolver>> authenticator_requests_;
 };