Implement some default behaviors for card name/expiration fixers

- Just use the inferred name or empty string
- Always cancel the expiration flow

Change-Id: I8e017deebcdd417347534d03740d60e16d372003
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2441846Reviewed-by: Hiroshi Ichikawa <ichikawa@chromium.org>
Commit-Queue: John Wu <jzw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812741}

ios/web_view/shell/shell_autofill_delegate.m

@@ -158,6 +158,16 @@
                  completion:nil];
 }
 
+- (void)autofillController:(CWVAutofillController*)autofillController
+    confirmCreditCardNameWithFixer:(CWVCreditCardNameFixer*)fixer {
+  [fixer acceptWithName:fixer.inferredCardHolderName ?: @""];
+}
+
+- (void)autofillController:(CWVAutofillController*)autofillController
+    confirmCreditCardExpirationWithFixer:(CWVCreditCardExpirationFixer*)fixer {
+  [fixer cancel];
+}
+
 - (void)autofillController:(CWVAutofillController*)autofillController
     decideSavePolicyForPassword:(CWVPassword*)password
                 decisionHandler:(void (^)(CWVPasswordUserDecision decision))