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HTTP auth prompts show a blank interstitial which causes the omnibox to show
 the correct URL and page contents to clear in order to prevent phishing. The
logic for this interstitial currently checks only for the visible URL. This misses
the case where the user navigates directly the URL: The URL of the resource
with HTTP Auth will be the same as the visible entry so no interstitial will be
shown. This patch adds a check to see if the last committed entry is also
different then the URL of the resource with HTTP Auth.

BUG=396961
TEST=LoginPromptBrowserTest.*

Review URL: https://codereview.chromium.org/410373003

Cr-Commit-Position: refs/heads/master@{#290090}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@290090 0039d316-1c4b-4281-b951-d872f2087c98