Sync the File API interfaces with the spec

Source/core/fileapi/File.idl

 /*
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-// TODO(jsbell): fileName parameter has [EnsureUTF16] in the spec; use USVString?
+// https://w3c.github.io/FileAPI/#file
 
-// http://dev.w3.org/2006/webapi/FileAPI/#dfn-file
 [
+    // TODO(jsbell): fileName parameter has [EnsureUTF16] in the spec; use
+    // USVString? https://github.com/w3c/FileAPI/issues/9
     Constructor(sequence<(Blob or DOMString or ArrayBufferView or ArrayBuffer)> fileBits, DOMString fileName, optional FilePropertyBag options),
     RaisesException=Constructor,
     Exposed=(Window,Worker),
 ] interface File : Blob {
     readonly attribute DOMString name;
     readonly attribute long long lastModified;
+
+    // Non-standard APIs
     [MeasureAs=FileGetLastModifiedDate] readonly attribute Date lastModifiedDate;
     [MeasureAs=PrefixedFileRelativePath] readonly attribute DOMString webkitRelativePath;
 };