Tether: Do not log password of host hotspot.

Bug: 738233
Change-Id: I7c8f474904a4203ee7c069a674722c3bc60545c4
Reviewed-on: https://chromium-review.googlesource.com/575764
Commit-Queue: Ryan Hansberry <hansberry@chromium.org>
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487333}

chromeos/components/tether/tether_connector.cc

@@ -147,8 +147,7 @@ void TetherConnector::OnSuccessfulConnectTetheringResponse(
 
   PA_LOG(INFO) << "Received successful ConnectTetheringResponse from device "
                << "with ID " << remote_device.GetTruncatedDeviceIdForLogs()
-               << ". SSID: \"" << ssid << "\", Password: \"" << password
-               << "\"";
+               << ". SSID: \"" << ssid << "\".";
 
   // Make a copy of the device ID, SSID, and password to pass below before
   // destroying |connect_tethering_operation_|.