Updated to Chrome 45 (2454) moved from SVN to git.

modules/fetch/Headers.idl

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // http://fetch.spec.whatwg.org/#headers-class
 typedef Dictionary OpenEndedDictionary;
 [
     Constructor,
     Constructor(Headers input),
     Constructor(OpenEndedDictionary input),
-    RuntimeEnabled=ServiceWorker,
-    Exposed=ServiceWorker,
+    Constructor(sequence<sequence<ByteString>> input),
+    Exposed=(Window,Worker),
     RaisesException=Constructor,
     GarbageCollected,
+    TypeChecking=Interface,
 ] interface Headers {
     [RaisesException] void append(ByteString name, ByteString value);
     [ImplementedAs=remove, RaisesException] void delete(ByteString key);
     [RaisesException] ByteString? get(ByteString key);
     [RaisesException] sequence<ByteString> getAll(ByteString name);
     [RaisesException] boolean has(ByteString key);
     [RaisesException] void set(ByteString key, ByteString value);
-
-    // The following are not defined in the spec.
-    // FIXME: We should implement Headers.prototype[Symbol.iterator] instead of
-    // forEach and size.
-    // https://www.w3.org/Bugs/Public/show_bug.cgi?id=26102
-    readonly attribute unsigned long size;
-    void forEach(HeadersForEachCallback callback, optional any thisArg);
+    iterable<ByteString, ByteString>;
 };