Revert of [Autofill] Enable Autofill UKM by default.

components/autofill/core/browser/autofill_metrics.cc

Index: components/autofill/core/browser/autofill_metrics.cc
diff --git a/components/autofill/core/browser/autofill_metrics.cc b/components/autofill/core/browser/autofill_metrics.cc
index 20ae1e78bf76a28a828c4f1f69fa824cc41c088e..bb0cac81f67629473b4d857d929317467d220e6d 100644
--- a/components/autofill/core/browser/autofill_metrics.cc
+++ b/components/autofill/core/browser/autofill_metrics.cc
@@ -793,7 +793,8 @@
     const GURL& url,
     const std::string& ukm_entry_name,
     const std::vector<std::pair<const char*, int>>& metrics) {
-  if (!ukm_service || !url.is_valid() || metrics.empty()) {
+  if (!IsUkmLoggingEnabled() || !ukm_service || !url.is_valid() ||
+      metrics.empty()) {
     return false;
   }
 
@@ -1034,7 +1035,7 @@
 
 void AutofillMetrics::FormInteractionsUkmLogger::OnFormsParsed(
     const GURL& url) {
-  if (ukm_service_ == nullptr)
+  if (!IsUkmLoggingEnabled() || ukm_service_ == nullptr)
     return;
 
   url_ = url;
@@ -1152,7 +1153,7 @@
 }
 
 bool AutofillMetrics::FormInteractionsUkmLogger::CanLog() const {
-  return ukm_service_ && url_.is_valid();
+  return IsUkmLoggingEnabled() && ukm_service_ && url_.is_valid();
 }
 
 int64_t