Remove some obsolete FIXMEs for HTMLAllCollection

third_party/WebKit/Source/core/html/HTMLAllCollection.idl

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2014 Samsung Electronics. All rights reserved.
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 // https://html.spec.whatwg.org/#the-htmlallcollection-interface
 
-// FIXME: This interface should inherit HTMLCollection.
 [
     Custom=LegacyCallAsFunction,
     DependentLifetime,
     SetWrapperReferenceFrom=ownerNode,
     WillBeGarbageCollected,
 ] interface HTMLAllCollection {
-    // FIXME: length and 'getter' should be inherited from HTMLCollection.
     readonly attribute unsigned long length;
     [ImplementedAs=item] getter Element (unsigned long index);
     // FIXME: The custom item() implementation may return a NodeList, but the
     // spec has a (HTMLCollection or Element)? item(DOMString name) method.
     [Custom] Element? item([Default=Undefined] optional unsigned long index);
-    // FIXME:
     // FIXME: namedItem() should be a legacycaller. crbug.com/465009
     // FIXME: namedItem() should return an (HTMLCollection or Element)? union.
     [ImplementedAs=namedGetter] getter (NodeList or Element)? namedItem(DOMString name);
 };