PushEvent.data should be NULL for empty payloads

third_party/WebKit/LayoutTests/http/tests/push_messaging/resources/pushmessagedata-worker.js

Index: third_party/WebKit/LayoutTests/http/tests/push_messaging/resources/pushmessagedata-worker.js
diff --git a/third_party/WebKit/LayoutTests/http/tests/push_messaging/resources/pushmessagedata-worker.js b/third_party/WebKit/LayoutTests/http/tests/push_messaging/resources/pushmessagedata-worker.js
index 16fa54b771c909e7486a68d1267b9552749db560..df0ba48f41ba24b73280d6f652c7dea2f4b78887 100644
--- a/third_party/WebKit/LayoutTests/http/tests/push_messaging/resources/pushmessagedata-worker.js
+++ b/third_party/WebKit/LayoutTests/http/tests/push_messaging/resources/pushmessagedata-worker.js
@@ -27,32 +27,9 @@ test(function() {
 }, 'PushEvent can be initialized from ArrayBuffer, ArrayBufferView and USVStrings.');
 
 test(function() {
-    var pushMessageData = createPushMessageData();
-
-    assert_equals(pushMessageData.arrayBuffer().byteLength, 0);
-
-    assert_equals(pushMessageData.blob().size, 0);
-    assert_equals(pushMessageData.blob().type, '');
-
-    // PushMessageData.json() is specified to be identical to JSON.parse() with
-    // the message's data as the argument. JSON.parse('') throws an exception,
-    // so verify that calling json() without a body throws the same exception.
-    try {
-        pushMessageData.json();
-        assert_unreached('Expected an exception to be thrown.');
-    } catch (eventDataException) {
-        try {
-            JSON.parse('');
-            assert_unreached('Expected an exception to be thrown.');
-        } catch (jsonParseException) {
-            assert_equals(eventDataException.name, jsonParseException.name);
-            assert_equals(eventDataException.message, jsonParseException.message);
-        }
-    }
-
-    assert_equals(pushMessageData.text().length, 0);
-
-}, 'PushMessageData is empty by default.');
+    assert_equals(createPushMessageData(undefined), null);
+
+}, 'PushMessageData is null by default.');
 
 test(function() {
     const binaryContents = [1, 2, 3];