PushEvent.data should be NULL for empty payloads

third_party/WebKit/Source/modules/push_messaging/PushMessageData.cpp

Index: third_party/WebKit/Source/modules/push_messaging/PushMessageData.cpp
diff --git a/third_party/WebKit/Source/modules/push_messaging/PushMessageData.cpp b/third_party/WebKit/Source/modules/push_messaging/PushMessageData.cpp
index ea2617457d935d15fdd69c48d2fe93243e51310c..a7b133d9d2d7bbe82f776b135dd5b8fcb9ecc598 100644
--- a/third_party/WebKit/Source/modules/push_messaging/PushMessageData.cpp
+++ b/third_party/WebKit/Source/modules/push_messaging/PushMessageData.cpp
@@ -42,11 +42,7 @@ PushMessageData* PushMessageData::create(const ArrayBufferOrArrayBufferViewOrUSV
     }
 
     ASSERT(messageData.isNull());
-    return new PushMessageData();
-}
-
-PushMessageData::PushMessageData()
-{
+    return nullptr;
 }
 
 PushMessageData::PushMessageData(const char* data, unsigned bytesSize)