Mark some PrintPreviewUI methods as const.

chrome/browser/ui/webui/print_preview/print_preview_ui.h

 // Copyright (c) 2012 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_PRINT_PREVIEW_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_PRINT_PREVIEW_UI_H_
 
 #include <stdint.h>
 
 #include <string>
 
 #include "base/callback_forward.h"
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/time/time.h"
 #include "chrome/browser/ui/webui/constrained_web_dialog_ui.h"
 #include "printing/features/features.h"
 
-class PrintPreviewDataService;
 class PrintPreviewHandler;
 struct PrintHostMsg_DidGetPreviewPageCount_Params;
 struct PrintHostMsg_RequestPrintPreview_Params;
 struct PrintHostMsg_SetOptionsFromDocument_Params;
 
 namespace base {
 class FilePath;
 class RefCountedBytes;
 }
 
 namespace gfx {
 class Rect;
 }
 
 namespace printing {
 struct PageSizeMargins;
 }
 
 class PrintPreviewUI : public ConstrainedWebDialogUI {
  public:
   explicit PrintPreviewUI(content::WebUI* web_ui);
   ~PrintPreviewUI() override;
 
   // Gets the print preview |data|. |index| is zero-based, and can be
   // |printing::COMPLETE_PREVIEW_DOCUMENT_INDEX| to get the entire preview
   // document.
-  void GetPrintPreviewDataForIndex(int index,
-                                   scoped_refptr<base::RefCountedBytes>* data);
+  void GetPrintPreviewDataForIndex(
+      int index,
+      scoped_refptr<base::RefCountedBytes>* data) const;
 
   // Sets the print preview |data|. |index| is zero-based, and can be
   // |printing::COMPLETE_PREVIEW_DOCUMENT_INDEX| to set the entire preview
   // document.
   void SetPrintPreviewDataForIndex(int index,
                                    scoped_refptr<base::RefCountedBytes> data);
 
   // Clear the existing print preview data.
   void ClearAllPreviewData();
 
   // Returns the available draft page count.
-  int GetAvailableDraftPageCount();
+  int GetAvailableDraftPageCount() const;
 
   // Setters
   void SetInitiatorTitle(const base::string16& initiator_title);
 
-  base::string16 initiator_title() { return initiator_title_; }
+  const base::string16& initiator_title() const { return initiator_title_; }
 
-  bool source_is_modifiable() { return source_is_modifiable_; }
+  bool source_is_modifiable() const { return source_is_modifiable_; }
 
-  bool source_has_selection() { return source_has_selection_; }
+  bool source_has_selection() const { return source_has_selection_; }
 
-  bool print_selection_only() { return print_selection_only_; }
+  bool print_selection_only() const { return print_selection_only_; }
 
   // Set initial settings for PrintPreviewUI.
   static void SetInitialParams(
       content::WebContents* print_preview_dialog,
       const PrintHostMsg_RequestPrintPreview_Params& params);
 
   // Determines whether to cancel a print preview request based on
   // |preview_ui_id| and |request_id|.
   // Can be called from any thread.
   static void GetCurrentPrintPreviewStatus(int32_t preview_ui_id,
@@ skipping 73 matching lines @@
   // the printing without having to click a button on the print preview dialog.
   void SetSelectedFileForTesting(const base::FilePath& path);
 
   // Passes |closure| to PrintPreviewHandler::SetPdfSavedClosureForTesting().
   void SetPdfSavedClosureForTesting(const base::Closure& closure);
 
  private:
   FRIEND_TEST_ALL_PREFIXES(PrintPreviewDialogControllerUnitTest,
                            TitleAfterReload);
 
-  // Returns the Singleton instance of the PrintPreviewDataService.
-  PrintPreviewDataService* print_preview_data_service();
-
   base::TimeTicks initial_preview_start_time_;
 
   // The unique ID for this class instance. Stored here to avoid calling
   // GetIDForPrintPreviewUI() everywhere.
   const int32_t id_;
 
   // Weak pointer to the WebUI handler.
   PrintPreviewHandler* handler_;
 
   // Indicates whether the source document can be modified.
   bool source_is_modifiable_;
 
   // Indicates whether the source document has selection.
   bool source_has_selection_;
 
   // Indicates whether only the selection should be printed.
   bool print_selection_only_;
 
   // Store the initiator title, used for populating the print preview dialog
   // title.
   base::string16 initiator_title_;
 
   // Keeps track of whether OnClosePrintPreviewDialog() has been called or not.
   bool dialog_closed_;
 
   DISALLOW_COPY_AND_ASSIGN(PrintPreviewUI);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_PRINT_PREVIEW_UI_H_