Mark some PrintPreviewUI methods as const.

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

 // 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.
 
 #include "chrome/browser/ui/webui/print_preview/print_preview_ui.h"
 
 #include <map>
 #include <utility>
 #include <vector>
 
@@ skipping 48 matching lines @@
 
 namespace {
 
 #if defined(OS_MACOSX)
 // U+0028 U+21E7 U+2318 U+0050 U+0029 in UTF8
 const char kBasicPrintShortcut[] = "\x28\xE2\x8c\xA5\xE2\x8C\x98\x50\x29";
 #elif !defined(OS_CHROMEOS)
 const char kBasicPrintShortcut[] = "(Ctrl+Shift+P)";
 #endif
 
+PrintPreviewUI::TestingDelegate* g_testing_delegate = nullptr;
+
 // Thread-safe wrapper around a std::map to keep track of mappings from
 // PrintPreviewUI IDs to most recent print preview request IDs.
 class PrintPreviewRequestIdMapWithLock {
  public:
   PrintPreviewRequestIdMapWithLock() {}
   ~PrintPreviewRequestIdMapWithLock() {}
 
   // Gets the value for |preview_id|.
   // Returns true and sets |out_value| on success.
   bool Get(int32_t preview_id, int* out_value) {
@@ skipping 348 matching lines @@
   bool cups_and_md_settings_enabled =
       !base::CommandLine::ForCurrentProcess()->HasSwitch(
           ::switches::kDisableNativeCups);
   source->AddBoolean("showLocalManageButton", cups_and_md_settings_enabled);
 #else
   source->AddBoolean("showLocalManageButton", true);
 #endif
   return source;
 }
 
-PrintPreviewUI::TestingDelegate* g_testing_delegate = NULL;
-
 }  // namespace
 
 PrintPreviewUI::PrintPreviewUI(content::WebUI* web_ui)
     : ConstrainedWebDialogUI(web_ui),
       initial_preview_start_time_(base::TimeTicks::Now()),
       id_(g_print_preview_ui_id_map.Get().Add(this)),
       handler_(nullptr),
       source_is_modifiable_(true),
       source_has_selection_(false),
       print_selection_only_(false),
       dialog_closed_(false) {
   // Set up the chrome://print/ data source.
   Profile* profile = Profile::FromWebUI(web_ui);
   content::WebUIDataSource::Add(profile, CreatePrintPreviewUISource());
 
   // Set up the chrome://theme/ source.
   content::URLDataSource::Add(profile, new ThemeSource(profile));
 
   auto handler = base::MakeUnique<PrintPreviewHandler>();
   handler_ = handler.get();
   web_ui->AddMessageHandler(std::move(handler));
   web_ui->AddMessageHandler(base::MakeUnique<MetricsHandler>());
 
   g_print_preview_request_id_map.Get().Set(id_, -1);
 }
 
 PrintPreviewUI::~PrintPreviewUI() {
-  print_preview_data_service()->RemoveEntry(id_);
+  PrintPreviewDataService::GetInstance()->RemoveEntry(id_);
   g_print_preview_request_id_map.Get().Erase(id_);
   g_print_preview_ui_id_map.Get().Remove(id_);
 }
 
 void PrintPreviewUI::GetPrintPreviewDataForIndex(
     int index,
-    scoped_refptr<base::RefCountedBytes>* data) {
-  print_preview_data_service()->GetDataEntry(id_, index, data);
+    scoped_refptr<base::RefCountedBytes>* data) const {
+  PrintPreviewDataService::GetInstance()->GetDataEntry(id_, index, data);
 }
 
 void PrintPreviewUI::SetPrintPreviewDataForIndex(
     int index,
     scoped_refptr<base::RefCountedBytes> data) {
-  print_preview_data_service()->SetDataEntry(id_, index, std::move(data));
+  PrintPreviewDataService::GetInstance()->SetDataEntry(id_, index,
+                                                       std::move(data));
 }
 
 void PrintPreviewUI::ClearAllPreviewData() {
-  print_preview_data_service()->RemoveEntry(id_);
+  PrintPreviewDataService::GetInstance()->RemoveEntry(id_);
 }
 
-int PrintPreviewUI::GetAvailableDraftPageCount() {
-  return print_preview_data_service()->GetAvailableDraftPageCount(id_);
+int PrintPreviewUI::GetAvailableDraftPageCount() const {
+  return PrintPreviewDataService::GetInstance()->GetAvailableDraftPageCount(
+      id_);
 }
 
 void PrintPreviewUI::SetInitiatorTitle(
     const base::string16& job_title) {
   initiator_title_ = job_title;
 }
 
 // static
 void PrintPreviewUI::SetInitialParams(
     content::WebContents* print_preview_dialog,
@@ skipping 135 matching lines @@
 
 void PrintPreviewUI::OnPrintPreviewFailed() {
   handler_->OnPrintPreviewFailed();
   web_ui()->CallJavascriptFunctionUnsafe("printPreviewFailed");
 }
 
 void PrintPreviewUI::OnInvalidPrinterSettings() {
   web_ui()->CallJavascriptFunctionUnsafe("invalidPrinterSettings");
 }
 
-PrintPreviewDataService* PrintPreviewUI::print_preview_data_service() {
-  return PrintPreviewDataService::GetInstance();
-}
-
 void PrintPreviewUI::OnHidePreviewDialog() {
   WebContents* preview_dialog = web_ui()->GetWebContents();
   printing::BackgroundPrintingManager* background_printing_manager =
       g_browser_process->background_printing_manager();
   if (background_printing_manager->HasPrintPreviewDialog(preview_dialog))
     return;
 
   ConstrainedWebDialogDelegate* delegate = GetConstrainedDelegate();
   if (!delegate)
     return;
@@ skipping 37 matching lines @@
 }
 
 void PrintPreviewUI::SetSelectedFileForTesting(const base::FilePath& path) {
   handler_->FileSelected(path, 0, NULL);
 }
 
 void PrintPreviewUI::SetPdfSavedClosureForTesting(
     const base::Closure& closure) {
   handler_->SetPdfSavedClosureForTesting(closure);
 }