Switch to standard integer types in chrome/browser/, part 1 of 4.

chrome/browser/download/download_shelf.h

Index: chrome/browser/download/download_shelf.h
diff --git a/chrome/browser/download/download_shelf.h b/chrome/browser/download/download_shelf.h
index bf3de9403c6a67e8ea4ca4a8f59fc34ae42d9602..67d698dc25a78fbd4435873b15c7e90b5084ff04 100644
--- a/chrome/browser/download/download_shelf.h
+++ b/chrome/browser/download/download_shelf.h
@@ -5,6 +5,8 @@
 #ifndef CHROME_BROWSER_DOWNLOAD_DOWNLOAD_SHELF_H_
 #define CHROME_BROWSER_DOWNLOAD_DOWNLOAD_SHELF_H_
 
+#include <stdint.h>
+
 #include "base/memory/weak_ptr.h"
 #include "base/time/time.h"
 #include "build/build_config.h"
@@ -138,7 +140,7 @@ class DownloadShelf {
   // Similar to ShowDownload() but refers to the download using an ID. This
   // download should belong to the DownloadManager returned by
   // GetDownloadManager().
-  void ShowDownloadById(int32 download_id);
+  void ShowDownloadById(int32_t download_id);
 
   bool should_show_on_unhide_;
   bool is_hidden_;