PrintPreview: Added a helper function to get print job settings from dictionary.

printing/printing_context_mac.mm

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "printing/printing_context_mac.h"
 
 #import <ApplicationServices/ApplicationServices.h>
 #import <AppKit/AppKit.h>
 
 #include "base/logging.h"
 #include "base/mac/scoped_cftyperef.h"
 #include "base/sys_string_conversions.h"
 #include "base/values.h"
-#include "printing/print_job_constants.h"
 #include "printing/print_settings_initializer_mac.h"
 
 namespace printing {
 
 // static
 PrintingContext* PrintingContext::Create(const std::string& app_locale) {
   return static_cast<PrintingContext*>(new PrintingContextMac(app_locale));
 }
 
 PrintingContextMac::PrintingContextMac(const std::string& app_locale)
@@ skipping 61 matching lines @@
     const DictionaryValue& job_settings, const PageRanges& ranges) {
   DCHECK(!in_print_job_);
 
   // TODO (kmadhusu): Update other print job settings such as number of copies,
   // collate, etc.,
 
   ResetSettings();
   print_info_.reset([[NSPrintInfo sharedPrintInfo] copy]);
 
   bool landscape;
-  if (!job_settings.GetBoolean(kSettingLandscape, &landscape))
+  std::string printer_name;
+  if (!GetSettingsFromDict(job_settings, &landscape, &printer_name))
     return OnError();
+
   settings_.SetOrientation(landscape);
 
-  std::string printer_name;
-  if (!job_settings.GetString(kSettingPrinterName, &printer_name))
-    return OnError();
-
   if (!SetPrinter(printer_name))
     return OnError();
 
   InitPrintSettingsFromPrintInfo(ranges);
   return OK;
 }
 
 void PrintingContextMac::InitPrintSettingsFromPrintInfo(
     const PageRanges& ranges) {
   PMPrintSession print_session =
@@ skipping 137 matching lines @@
 void PrintingContextMac::ReleaseContext() {
   print_info_.reset();
   context_ = NULL;
 }
 
 gfx::NativeDrawingContext PrintingContextMac::context() const {
   return context_;
 }
 
 }  // namespace printing