Switch to standard integer types in components/, part 3 of 4.

BUG=138542
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Review URL: https://codereview.chromium.org/1551433002

Cr-Commit-Position: refs/heads/master@{#366874}
diff --git a/components/omnibox/browser/search_provider.cc b/components/omnibox/browser/search_provider.cc
index b26910c..72cb2fe4 100644
--- a/components/omnibox/browser/search_provider.cc
+++ b/components/omnibox/browser/search_provider.cc
@@ -4,6 +4,8 @@
 
 #include "components/omnibox/browser/search_provider.h"
 
+#include <stddef.h>
+
 #include <algorithm>
 #include <cmath>