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This change removes the 'view original' link and replaces it with
a button that currently navigates to the original article but will
eventually slide the view out of focus.

The feedback form and close button now span the full width of a page
while content is limited to 800px wide.

BUG=428533

Review URL: https://codereview.chromium.org/1160113004

Cr-Commit-Position: refs/heads/master@{#333759}