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Incognito mode may be always-on by configuration policy. When that is set then
the TaskManager shouldn't open a new non-incognito window.

The TaskManager doesn't have an associated Profile, so it uses the last used
Profile. This change introduces a getter for the last used allowed Profile,
which returns the OTR Profile if that's dictated by policy.

BUG=244246

Review URL: https://chromiumcodereview.appspot.com/16072014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@203128 0039d316-1c4b-4281-b951-d872f2087c98