Fix #11435. Remove obsolete test code.

test/unit/data.js

@@ -184,9 +184,6 @@ test(".data()", function() {
 
 	var dataObj = div.data();
 
-	// TODO: Remove this hack which was introduced in 1.5.1
-	delete dataObj.toJSON;
-
 	deepEqual( dataObj, {test: "success"}, "data() get the entire data object" );
 	strictEqual( div.data("foo"), undefined, "Make sure that missing result is still undefined" );
 
@@ -198,9 +195,6 @@ test(".data()", function() {
 
 	dataObj = jQuery.extend(true, {}, jQuery(obj).data());
 
-	// TODO: Remove this hack which was introduced for 1.5.1
-	delete dataObj.toJSON;
-
 	deepEqual( dataObj, { foo: "baz" }, "Retrieve data object from a wrapped JS object (#7524)" );
 });