Improve showing the printer management UI on Linux with Cinnamon.

Some users with Cinnamon use gnome-control-center for native printer
management. So try launching it for Cinnamon users.

BUG=869845

Change-Id: Icbb73dd4db72c5151175015ffd8e6d0aaae76cf4
Reviewed-on: https://chromium-review.googlesource.com/1226529Reviewed-by: Christian Dullweber <dullweber@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#591308}

chrome/browser/printing/printer_manager_dialog_linux.cc

@@ -66,13 +66,13 @@ void DetectAndOpenPrinterConfigDialog() {
       opened = OpenPrinterConfigDialog(kKde5KcmPrinterCommand) ||
                OpenPrinterConfigDialog(kSystemConfigPrinterCommand);
       break;
-    case base::nix::DESKTOP_ENVIRONMENT_CINNAMON:
     case base::nix::DESKTOP_ENVIRONMENT_KDE3:
     case base::nix::DESKTOP_ENVIRONMENT_PANTHEON:
     case base::nix::DESKTOP_ENVIRONMENT_UNITY:
     case base::nix::DESKTOP_ENVIRONMENT_XFCE:
       opened = OpenPrinterConfigDialog(kSystemConfigPrinterCommand);
       break;
+    case base::nix::DESKTOP_ENVIRONMENT_CINNAMON:
     case base::nix::DESKTOP_ENVIRONMENT_GNOME:
     case base::nix::DESKTOP_ENVIRONMENT_OTHER:
       opened = OpenPrinterConfigDialog(kSystemConfigPrinterCommand) ||