Move margin processing code to the browser process.

printing/print_dialog_gtk_interface.h

Index: printing/print_dialog_gtk_interface.h
diff --git a/printing/print_dialog_gtk_interface.h b/printing/print_dialog_gtk_interface.h
index 4fb9341d87687e4a34e6fab75846c73c750878aa..e7c005e6ac26beabd45400fe8fab003aabb11a8c 100644
--- a/printing/print_dialog_gtk_interface.h
+++ b/printing/print_dialog_gtk_interface.h
@@ -11,6 +11,7 @@
 namespace printing {
 
 class Metafile;
+class PrintSettings;
 
 // An interface for GTK printing dialogs. Classes that live outside of
 // printing/ can implement this interface and get threading requirements
@@ -24,8 +25,9 @@ class PrintDialogGtkInterface {
   // dictionary of settings with possible keys from
   // printing/print_job_constants.h. Only used when printing without the system
   // print dialog. E.g. for Print Preview. Returns false on error.
-  virtual bool UpdateSettings(const base::DictionaryValue& settings,
-                              const PageRanges& ranges) = 0;
+  virtual bool UpdateSettings(const base::DictionaryValue& job_settings,
+                              const PageRanges& ranges,
+                              PrintSettings* settings) = 0;
 
   // Shows the dialog and handles the response with |callback|. Only used when
   // printing with the native print dialog.