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

BUG=138542
[email protected]
NOPRESUBMIT=true

Review URL: https://codereview.chromium.org/1545223002

Cr-Commit-Position: refs/heads/master@{#366884}
diff --git a/chrome/browser/spellchecker/spellcheck_host_metrics.h b/chrome/browser/spellchecker/spellcheck_host_metrics.h
index d28b09a7..fe0df157 100644
--- a/chrome/browser/spellchecker/spellcheck_host_metrics.h
+++ b/chrome/browser/spellchecker/spellcheck_host_metrics.h
@@ -5,6 +5,8 @@
 #ifndef CHROME_BROWSER_SPELLCHECKER_SPELLCHECK_HOST_METRICS_H_
 #define CHROME_BROWSER_SPELLCHECKER_SPELLCHECK_HOST_METRICS_H_
 
+#include <stddef.h>
+
 #include <string>
 #include <vector>