[PageLoadMetrics] Enable AdsPageLoadMetrics once again

chrome/browser/page_load_metrics/observers/ads_page_load_metrics_observer.cc

Index: chrome/browser/page_load_metrics/observers/ads_page_load_metrics_observer.cc
diff --git a/chrome/browser/page_load_metrics/observers/ads_page_load_metrics_observer.cc b/chrome/browser/page_load_metrics/observers/ads_page_load_metrics_observer.cc
index 39962af7534a63b862acdf0c56ebdcc7cc3f436e..33819bd406ddf05287efca967742e40ef8ba2fac 100644
--- a/chrome/browser/page_load_metrics/observers/ads_page_load_metrics_observer.cc
+++ b/chrome/browser/page_load_metrics/observers/ads_page_load_metrics_observer.cc
@@ -19,8 +19,7 @@
 
 namespace {
 
-const base::Feature kAdsFeature{"AdsMetrics",
-                                base::FEATURE_DISABLED_BY_DEFAULT};
+const base::Feature kAdsFeature{"AdsMetrics", base::FEATURE_ENABLED_BY_DEFAULT};
 
 bool FrameIsAd(content::NavigationHandle* navigation_handle) {
   // Because sub-resource filtering isn't always enabled, and doesn't work