Remove unnecessary ignore: override_on_non_overriding_member (flutter#99793)

Author: brianquinlan

packages/flutter_test/lib/src/_binding_io.dart

@@ -115,7 +115,6 @@ class _MockHttpClient implements HttpClient {
   void addProxyCredentials(String host, int port, String realm, HttpClientCredentials credentials) { }
 
   @override
-  // ignore: override_on_non_overriding_member
   Future<ConnectionTask<Socket>> Function(Uri url, String? proxyHost, int? proxyPort)? connectionFactory;
 
   @override
@@ -128,7 +127,6 @@ class _MockHttpClient implements HttpClient {
   bool Function(X509Certificate cert, String host, int port)? badCertificateCallback;
 
   @override
-  // ignore: override_on_non_overriding_member
   Function(String line)? keyLog;
 
   @override

packages/flutter_tools/test/src/fake_http_client.dart

@@ -141,7 +141,6 @@ class FakeHttpClient implements HttpClient {
   }
 
   @override
-  // ignore: override_on_non_overriding_member
   Future<ConnectionTask<Socket>> Function(Uri url, String? proxyHost, int? proxyPort)? connectionFactory;
 
   @override
@@ -154,7 +153,6 @@ class FakeHttpClient implements HttpClient {
   bool Function(X509Certificate cert, String host, int port)? badCertificateCallback;
 
   @override
-  // ignore: override_on_non_overriding_member
   Function(String line)? keyLog;
 
   @override