PrintPreview: Set number of copies and collate in print ticket.

BUG=none
TEST=Enable print preview on mac. Print preview a webpage. Change the number of copies and collate setting values. Print the preview data.

Review URL: http://codereview.chromium.org/6780001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@80499 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/printing/printing_context_cairo.cc b/printing/printing_context_cairo.cc
index 17e7885..7f31efb 100644
--- a/printing/printing_context_cairo.cc
+++ b/printing/printing_context_cairo.cc
@@ -6,6 +6,7 @@
 
 #include "base/logging.h"
 #include "base/values.h"
+#include "printing/print_job_constants.h"
 #include "printing/print_settings_initializer_gtk.h"
 #include "printing/units.h"
 
@@ -153,7 +154,7 @@
   DCHECK(!in_print_job_);
 
   bool landscape;
-  if (!GetSettingsFromDict(job_settings, &landscape, NULL))
+  if (!job_settings.GetBoolean(kSettingLandscape, &landscape))
     return OnError();
 
   settings_.SetOrientation(landscape);