Remove type() method from Tag object (WebAssembly#318)

This method mirrors the type methods on the other interfaces (Global, Memory,
etc) as defined in the JS type reflection proposal
(https://github.com/WebAssembly/js-types/blob/main/proposals/js-types/Overview.md)
Since this proposal will be standardized first, JS types should be rebased on top
of exception-handling, and this method should be moved there.

document/js-api/index.bs

@@ -1199,7 +1199,6 @@ dictionary TagType {
 [LegacyNamespace=WebAssembly, Exposed=(Window,Worker,Worklet)]
 interface Tag {
   constructor(TagType type);
-  TagType type();
 };
 </pre>
 
@@ -1244,21 +1243,6 @@ The <dfn constructor for="Tag" lt="Tag(type)">new Tag(|type|)</dfn> constructor
 
 </div>
 
-<div algorithm>
-
-The <dfn method for="Tag">type()</dfn> method steps are:
-
-1. Let |store| be the [=surrounding agent=]'s [=associated store=].
-1. Let [|parameters|] → [] be [=tag_type=](|store|, **this**.\[[Address]]).
-1. Let |idlParameters| be «».
-1. [=list/iterate|For each=] |type| of |parameters|,
-    1. [=list/Append=] [$FromValueType$](|type|) to |idlParameters|.
-1. Return «[ "{{TagType/parameters}}" → |idlParameters| ]».
-
-Advisement: This method is only expected to be implemented or shipped when both this proposal and the Type Reflection proposal are implemented or shipped (respectively).
-
-</div>
-
 <h4 id="runtime-exceptions">Runtime exceptions</h4>
 
 <pre class="idl">