Add a spec link for the Iterator interface
Add a spec link for the Iterator interface

BUG=460722
NOTRY=true

Review URL: https://codereview.chromium.org/966163002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@191071 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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