Remove some more bad ASCII-centric autofill code.

components/autofill/core/browser/credit_card.h

Index: components/autofill/core/browser/credit_card.h
diff --git a/components/autofill/core/browser/credit_card.h b/components/autofill/core/browser/credit_card.h
index b25ec8c2d2fa728ba6067b4d72c6555bf4a4ac96..3ef40b9c557a13676a961c92549418fed7cefd4e 100644
--- a/components/autofill/core/browser/credit_card.h
+++ b/components/autofill/core/browser/credit_card.h
@@ -172,6 +172,10 @@ class CreditCard : public AutofillDataModel {
   // Sets |number_| to |number| and computes the appropriate card |type_|.
   void SetNumber(const base::string16& number);
 
+  static bool ConvertMonth(const base::string16& month,

[Lei Zhang, 2015/04/11 02:44:17]

The behavior is a bit quirky. Document? Esp. handling of empty |month| and
values like "10".

[Evan Stade, 2015/04/13 18:13:43]

Done.

+                           const std::string& app_locale,
+                           int* num);
+
  private:
   // FormGroup:
   void GetSupportedTypes(ServerFieldTypeSet* supported_types) const override;