Contact Dashboard link should not be displayed when user is viewing a Drupal user page for contact they don't have access to

As reported in this forum post:

Logged in Drupal user has the following permissions (admin/user/permissions):

• CiviCRM: access Contact Dashboard
• user module: access user profiles
  There are no ACLs so this user doesn't have permission to view or edit any other CiviCRM contacts.

Expected Behavior:

• When they view their own user page (user or user/$theirUserId) - they get a link to their Contact Dashboard
• When they view any other user page - the "View Contact Dashboard" should NOT be displayed

Current Behavior:

• A link to "View Contact Dashboard" is displayed both on their "own page", AND when viewing other user/xxx pages.

NOTE: If the user clicks the dashboard link on another user's page, they get Access Denied - which is the correct behavior. However, they should never see the link in this situation.