Use OffTheRecord profile in Guest mode to open browser windows

This change guarantees the USB printer config and the print job
notfications only use the OffTheRecord(OTR) profile to open System Web
Apps(SWA) in Guest mode. There is an existing check
(https://source.chromium.org/chromium/chromium/src/+/master:chrome/browser/ui/browser.cc;l=471)
that only OTR guest profiles are allowed to open SWAs.

Change-Id: I78aef11b2d2cb8377f17ecd90f494828119ddf1a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2372909Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Reviewed-by: Sean Kau <skau@chromium.org>
Commit-Queue: Gavin Williams <gavinwill@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801834}

chrome/browser/chromeos/printing/cups_print_job_notification.cc

@@ -133,8 +133,13 @@ void CupsPrintJobNotification::Click(
     const base::Optional<base::string16>& reply) {
   if (!button_index) {
     if (base::FeatureList::IsEnabled(features::kPrintJobManagementApp)) {
+      // If we are in guest mode then we need to use the OffTheRecord profile to
+      // open the Print Manageament App. There is a check in Browser::Browser
+      // that only OffTheRecord profiles can open browser windows in guest mode.
       chrome::ShowPrintManagementApp(
-          profile_, PrintManagementAppEntryPoint::kNotification);
+          profile_->IsGuestSession() ? profile_->GetPrimaryOTRProfile()
+                                     : profile_,
+          PrintManagementAppEntryPoint::kNotification);
     }
     return;
   }

chrome/browser/chromeos/printing/usb_printer_notification.cc

@@ -81,8 +81,13 @@ void UsbPrinterNotification::Click(
     // Body of notification clicked.
     visible_ = false;
     if (type_ == Type::kConfigurationRequired) {
+      // If we are in guest mode then we need to use the OffTheRecord profile to
+      // open the Settings page. There is a check in Browser::Browser that only
+      // OffTheRecord profiles can open browser windows in guest mode.
       chrome::SettingsWindowManager::GetInstance()->ShowOSSettings(
-          profile_, chromeos::settings::mojom::kPrintingDetailsSubpagePath);
+          profile_->IsGuestSession() ? profile_->GetPrimaryOTRProfile()
+                                     : profile_,
+          chromeos::settings::mojom::kPrintingDetailsSubpagePath);
     }
     return;
   }