Change the behavior of the [X] Save details to Wallet checkbox notification to:

chrome/browser/ui/autofill/autofill_dialog_types.h

Index: chrome/browser/ui/autofill/autofill_dialog_types.h
diff --git a/chrome/browser/ui/autofill/autofill_dialog_types.h b/chrome/browser/ui/autofill/autofill_dialog_types.h
index f144d8c32c24fa26d2dbb4d47402fe85101757cf..bd1b73c595a1708545c691085c73fc6ec6433165 100644
--- a/chrome/browser/ui/autofill/autofill_dialog_types.h
+++ b/chrome/browser/ui/autofill/autofill_dialog_types.h
@@ -95,12 +95,20 @@ class DialogNotification {
   const string16& display_text() const { return display_text_; }
   Type type() const { return type_; }
 
+  void set_checked(bool checked) { checked_ = checked; }
+  bool checked() const { return checked_; }
+
   void set_interactive(bool interactive) { interactive_ = interactive; }
   bool interactive() const { return interactive_; }
 
  private:
   Type type_;
   string16 display_text_;
+
+  // Whether the dialog notification's checkbox should be checked. Only applies
+  // when |HasCheckbox()| is true.
+  bool checked_;
+
   // When false, this disables user interaction with the notification. For
   // example, WALLET_USAGE_CONFIRMATION notifications set this to false after
   // the submit flow has started.