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Zoom should be preserved on reload. However, this behavior is not currently
reliably covered by tests (there is a layout test that attempts to cover this
behavior, but it is broken and will shortly be removed, as per comment 28 on
crbug.com/673065). This CL adds a proper test of this behavior.

BUG=673065

Review-Url: https://codereview.chromium.org/2608213003
Cr-Commit-Position: refs/heads/master@{#441449}