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We'll add an integrated page as a further test case next.

Also, this fixes the missing URL for core-scroll-header

BUG=401203, 394756

Review URL: https://codereview.chromium.org/451483002

Cr-Commit-Position: refs/heads/master@{#290698}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@290698 0039d316-1c4b-4281-b951-d872f2087c98