Cleanup: Fix some misc nits in printing code.

chrome/browser/printing/print_preview_data_service.h

Index: chrome/browser/printing/print_preview_data_service.h
diff --git a/chrome/browser/printing/print_preview_data_service.h b/chrome/browser/printing/print_preview_data_service.h
index ca2fe83e2a7fd2bfbadafbc6ad6d3bf70bca2316..9ed94fdd70f27f175812c351b4e786b69da21f63 100644
--- a/chrome/browser/printing/print_preview_data_service.h
+++ b/chrome/browser/printing/print_preview_data_service.h
@@ -28,7 +28,7 @@ class PrintPreviewDataService {
   // |printing::COMPLETE_PREVIEW_DOCUMENT_INDEX| to represent complete preview
   // data. Use |index| to retrieve a specific preview page data. |data| is set
   // to NULL if the requested page is not yet available.
-  void GetDataEntry(int32 preview_ui_id, int index,
+  void GetDataEntry(int32_t preview_ui_id, int index,
                     scoped_refptr<base::RefCountedBytes>* data);
 
   // Set/Update the data entry in PrintPreviewDataStore. |index| is zero-based
@@ -36,14 +36,14 @@ class PrintPreviewDataService {
   // preview data. Use |index| to set/update a specific preview page data.
   // NOTE: PrintPreviewDataStore owns the data. Do not refcount |data| before
   // calling this function. It will be refcounted in PrintPreviewDataStore.
-  void SetDataEntry(int32 preview_ui_id, int index,
+  void SetDataEntry(int32_t preview_ui_id, int index,
                     const base::RefCountedBytes* data);
 
   // Remove the corresponding PrintPreviewUI entry from the map.
-  void RemoveEntry(int32 preview_ui_id);
+  void RemoveEntry(int32_t preview_ui_id);
 
   // Returns the available draft page count.
-  int GetAvailableDraftPageCount(int32 preview_ui_id);
+  int GetAvailableDraftPageCount(int32_t preview_ui_id);
 
  private:
   friend struct DefaultSingletonTraits<PrintPreviewDataService>;
@@ -51,8 +51,8 @@ class PrintPreviewDataService {
   // 1:1 relationship between PrintPreviewUI and data store object.
   // Key: PrintPreviewUI ID.
   // Value: Print preview data store object.
-  typedef std::map<int32, scoped_refptr<PrintPreviewDataStore> >
-      PreviewDataStoreMap;
+  using PreviewDataStoreMap =
+      std::map<int32_t, scoped_refptr<PrintPreviewDataStore>>;
 
   PrintPreviewDataService();
   virtual ~PrintPreviewDataService();