Switch to standard integer types in chrome/browser/extensions/.

BUG=138542
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Review URL: https://codereview.chromium.org/1549933002

Cr-Commit-Position: refs/heads/master@{#366840}
diff --git a/chrome/browser/extensions/external_install_error.cc b/chrome/browser/extensions/external_install_error.cc
index 8b42cb1..cd13c27 100644
--- a/chrome/browser/extensions/external_install_error.cc
+++ b/chrome/browser/extensions/external_install_error.cc
@@ -4,7 +4,10 @@
 
 #include "chrome/browser/extensions/external_install_error.h"
 
+#include <stddef.h>
+
 #include "base/bind.h"
+#include "base/macros.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/extensions/extension_install_prompt_show_params.h"