Opaque origins results in shields settings getting applied globally #59276

This was reported in 4051120 and 4051886. This seems like a regression that may have been introduced in this PR.

The core issue is that the primary_url is being evaluated as blank for opaque origins here.

  const GURL primary_url =
      navigation_handle->GetParentFrameOrOuterDocument()
          ? navigation_handle->GetParentFrameOrOuterDocument()
                ->GetOutermostMainFrame()
                ->GetLastCommittedOrigin()
                .GetURL()
          : url::Origin::Create(navigation_handle->GetURL()).GetURL();

which then is used to query the various ContentSettingType from the HostContentsSettingsMap and by default the map returns the default state to both get/set the corresponding type. We should ensure primary_url is not blank at this point.