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As of https://codereview.chromium.org/2926803002, when navigating to an existing
entry, the new navigation's SSLStatus remains unchanged from the existing
entry. This is incorrect for content status flags, which depend on the content
of the page; navigating to an existing entry does not mean that the content on
the page is the same as it was when we navigated away from the existing
entry. For this reason, this CL clears content status flags when a navigation
commits. Any content status flags that do apply to the new navigation should be
re-added as the content on the page loads.

Bug: 750649
Change-Id: I41441c90ddeb85b6cbf35e4b102ce322cffb7db9
Reviewed-on: https://chromium-review.googlesource.com/597488Reviewed-by: Eric Lawrence <elawrence@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Emily Stark <estark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491504}