Re: [whatwg/webidl] Allow DOMException subclasses to be used as exceptions (PR #1211)

@domenic commented on this pull request.



> +
+          readonly attribute unsigned long long errorCode;
+        };
+
+        dictionary ProtocolXErrorOptions {
+            required [EnforceRange] unsigned long long errorCode;
+        };
+    </pre>
+
+    Every <code>ProtocolXError</code> instance has an <dfn for="ProtocolXError">error code</dfn>,
+    a number.
+
+    <div algorithm="ProtocolXError constructor">
+        The <b><code>new ProtocolXError(|message|, |options|)</code></b> constructor steps are:
+
+        1.  Set [=this=]'s [=DOMException/name=] to "<code>ProtocolXError</code>".

They're not exported, for some reason! Let me fix that in this PR too.

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