[Autofill] Enable Autofill UKM by default.

components/autofill/core/browser/autofill_experiments.h

Index: components/autofill/core/browser/autofill_experiments.h
diff --git a/components/autofill/core/browser/autofill_experiments.h b/components/autofill/core/browser/autofill_experiments.h
index 94289f1f546c8b56491287f04f4aef3743e000de..11bbc0dffbd18c0a1b04dba21c80277ecbddab68 100644
--- a/components/autofill/core/browser/autofill_experiments.h
+++ b/components/autofill/core/browser/autofill_experiments.h
@@ -28,7 +28,6 @@ extern const base::Feature kAutofillCreditCardAssist;
 extern const base::Feature kAutofillScanCardholderName;
 extern const base::Feature kAutofillCreditCardPopupLayout;
 extern const base::Feature kAutofillCreditCardLastUsedDateDisplay;
-extern const base::Feature kAutofillUkmLogging;
 extern const base::Feature kAutofillUpstreamRequestCvcIfMissing;
 extern const base::Feature kAutofillUpstreamUseAutofillProfileComparatorForName;
 extern const char kCreditCardSigninPromoImpressionLimitParamKey[];
@@ -103,9 +102,6 @@ void ModifyAutofillCreditCardSuggestion(struct Suggestion* suggestion);
 // layout.
 unsigned int GetPopupMargin();
 
-// Returns whether the feature to log UKMs is enabled.
-bool IsUkmLoggingEnabled();
-
 // Returns whether the experiment is enabled where Chrome Upstream requests CVC
 // in the offer to save bubble if it was not detected during the checkout flow.
 bool IsAutofillUpstreamRequestCvcIfMissingExperimentEnabled();