[Autofill] Move IsValidState() into validation.h

components/autofill/browser/validation.h

Index: components/autofill/browser/validation.h
diff --git a/components/autofill/browser/validation.h b/components/autofill/browser/validation.h
index 618dcc139c5f785ca216122ad06447041f59a48b..eb7a6fcd8ebe63a74f4afb5c9082861c1a41e5a5 100644
--- a/components/autofill/browser/validation.h
+++ b/components/autofill/browser/validation.h
@@ -34,6 +34,10 @@ bool IsValidCreditCardSecurityCode(const base::string16& code,
 // Returns true if |text| looks like a valid e-mail address.
 bool IsValidEmailAddress(const base::string16& text);
 
+// Returns true if |text| is a valid US state name or abbreviation.  It is
+// case insensitive.  Valid for US states only.
+bool IsValidState(const base::string16& text);
+
 // Returns true if |text| looks like a valid zip code.
 // Valid for US zip codes only.
 bool IsValidZip(const base::string16& text);