Revert of [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 6a646c8f715b6679996b126999471d9369bf620f..5e3ef073a721fedc6e6985eb3384cf5d40a9ebd0 100644
--- a/components/autofill/core/browser/autofill_experiments.h
+++ b/components/autofill/core/browser/autofill_experiments.h
@@ -29,6 +29,7 @@
 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 base::Feature kAutofillUpstreamUseNotRecentlyUsedAutofillProfile;
@@ -104,6 +105,9 @@
 // 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();