[AF] Enable AutofillUpstreamEditableCardholderName by default

With the release of the cardholder name fix flow on iOS and conflicts
with Project Butter resolved in M76, we finally have feature parity
across all platforms and can enable this feature by default client-side.

Change-Id: I7ab9779188c3a1d913b998554568a6e03ef53415
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2017911Reviewed-by: Manas Verma <manasverma@google.com>
Commit-Queue: Jared Saul <jsaul@google.com>
Cr-Commit-Position: refs/heads/master@{#737505}

components/autofill/core/common/autofill_payments_features.cc

@@ -103,13 +103,7 @@ const base::Feature kAutofillUpstreamAlwaysRequestCardholderName{
 // name in the offer-to-save bubble if it was not detected or was conflicting
 // during the checkout flow and the user is NOT a Google Payments customer.
 const base::Feature kAutofillUpstreamEditableCardholderName{
-  "AutofillUpstreamEditableCardholderName",
-#if defined(OS_ANDROID)
-      base::FEATURE_ENABLED_BY_DEFAULT
-#else
-      base::FEATURE_DISABLED_BY_DEFAULT
-#endif
-};
+    "AutofillUpstreamEditableCardholderName", base::FEATURE_ENABLED_BY_DEFAULT};
 
 const base::Feature kAutofillUpstreamEditableExpirationDate{
   "AutofillUpstreamEditableExpirationDate",