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UX feedback is that users generally look at the keyboard when starting to
type passwords and thus miss the prompt. The UI will now show until the user
types 5 characters instead of being dismissed after they type anything.

BUG=318977

Review URL: https://codereview.chromium.org/447873004

Cr-Commit-Position: refs/heads/master@{#288935}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@288935 0039d316-1c4b-4281-b951-d872f2087c98