Sync the DataTransfer* interfaces with the spec

Source/core/clipboard/DataTransferItem.idl

Index: Source/core/clipboard/DataTransferItem.idl
diff --git a/Source/core/clipboard/DataTransferItem.idl b/Source/core/clipboard/DataTransferItem.idl
index 3db5e12ffa0309d7a08da45979339ecb818d282e..1ca6305bcaa11f9dfa1da7930ccb1776e8ef8463 100644
--- a/Source/core/clipboard/DataTransferItem.idl
+++ b/Source/core/clipboard/DataTransferItem.idl
@@ -35,8 +35,8 @@
 ] interface DataTransferItem {
     readonly attribute DOMString kind;
     readonly attribute DOMString type;
-
+    // TODO(philipj): The callback argument should be a FunctionStringCallback.
     [CallWith=ExecutionContext] void getAsString(StringCallback? callback);
-    Blob getAsFile();
+    // TODO(philipj): getAsFile() should return a File, not a Blob.

[dcheng, 2015/03/27 15:02:33]

This is https://crbug.com/361145 if you want to throw a link to it in.

[philipj_slow, 2015/03/27 18:00:06]

Thanks, added.

+    Blob? getAsFile();
 };
-