Revert 100233 - PrintPreview: Added code to identify the printer default duplex value.

chrome/browser/printing/print_dialog_gtk.cc

Index: chrome/browser/printing/print_dialog_gtk.cc
===================================================================
--- chrome/browser/printing/print_dialog_gtk.cc	(revision 100233)
+++ chrome/browser/printing/print_dialog_gtk.cc	(working copy)
@@ -200,24 +200,19 @@
     }
     gtk_print_settings_set(gtk_settings_, kCUPSColorModel, color_mode);
 
-    if (duplex_mode != printing::UNKNOWN_DUPLEX_MODE) {
-      const char* cups_duplex_mode;
-      switch (duplex_mode) {
-        case printing::LONG_EDGE:
-          cups_duplex_mode = kDuplexNoTumble;
-          break;
-        case printing::SHORT_EDGE:
-          cups_duplex_mode = kDuplexTumble;
-          break;
-        case printing::SIMPLEX:
-          cups_duplex_mode = kDuplexNone;
-          break;
-        default:  // UNKNOWN_DUPLEX_MODE
-          NOTREACHED();
-          break;
-      }
-      gtk_print_settings_set(gtk_settings_, kCUPSDuplex, cups_duplex_mode);
+    const char* cups_duplex_mode;
+    switch (duplex_mode) {
+      case printing::LONG_EDGE:
+        cups_duplex_mode = kDuplexNoTumble;
+        break;
+      case printing::SHORT_EDGE:
+        cups_duplex_mode = kDuplexTumble;
+        break;
+      default:
+        cups_duplex_mode = kDuplexNone;
+        break;
     }
+    gtk_print_settings_set(gtk_settings_, kCUPSDuplex, cups_duplex_mode);
   }
 
   gtk_print_settings_set_orientation(