[login-manager] enable logging for error_screen_handler and network_portal_detector modules.
[login-manager] enable logging for error_screen_handler and network_portal_detector modules.

This enables logging for network_portal_detector module.

network_portal_detector is a new module, that initiates portal
detection on the signin-screen. As we're planning to make it a default
portal detection module on the signin-screen, logging must be enabled
for it (at least until we will have enough logs from different places
with networks behind captive portal).

BUG=chromium:123579
TEST=manual tests on Lumpy

Change-Id: Ief4b8e63bdfa7c39af7b5be45acb387dd6e5a05e
Reviewed-on: https://gerrit.chromium.org/gerrit/38592
Reviewed-by: Yuri Gorshenin <f2779db90b423f363991b2b3f21619a51601ba1e@chromium.org>
Tested-by: Yuri Gorshenin <f2779db90b423f363991b2b3f21619a51601ba1e@chromium.org>
Reviewed-by: Chris Masone <98e3d65c6b0e9e2391eb4c2e8b1e572b77e544ed@chromium.org>
Commit-Ready: Yuri Gorshenin <f2779db90b423f363991b2b3f21619a51601ba1e@chromium.org>

chadversary/chromiumos.platform.login_manager,chadversary/chromiumos.platform.login_manager,chadversary/chromiumos.platform.login_manager