Add upstream

wp-content/plugins/jetpack/modules/widgets/contact-info/contact-info-admin.js

@@ -0,0 +1,11 @@
+( function( $ ) {
+	$( document ).on( 'change', '.jp-contact-info-showmap', function() {
+		var $checkbox = $( this ),
+			isChecked = $checkbox.is( ':checked' );
+
+		$checkbox
+			.closest( '.widget' )
+			.find( '.jp-contact-info-apikey' )
+			.toggle( isChecked );
+	} );
+} )( window.jQuery );

wp-content/plugins/jetpack/modules/widgets/contact-info/contact-info-map.css

@@ -0,0 +1,4 @@
+.contact-map {
+	max-width: 100%;
+	border: 0;
+}