Remove the notificationProvider extension API

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index 0191421e4b958b9179ac332b3845e25fcb9c0c31..26bb4cf12c2a34a80c190e9890ce0b2c6ca12522 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -87063,9 +87063,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="187" label="NETWORKING_PRIVATE_ON_NETWORK_LIST_CHANGED"/>
   <int value="188" label="NETWORKING_PRIVATE_ON_NETWORKS_CHANGED"/>
   <int value="189" label="NETWORKING_PRIVATE_ON_PORTAL_DETECTION_COMPLETED"/>
-  <int value="190" label="NOTIFICATION_PROVIDER_ON_CLEARED"/>
-  <int value="191" label="NOTIFICATION_PROVIDER_ON_CREATED"/>
-  <int value="192" label="NOTIFICATION_PROVIDER_ON_UPDATED"/>
+  <int value="190" label="DELETED_NOTIFICATION_PROVIDER_ON_CLEARED"/>
+  <int value="191" label="DELETED_NOTIFICATION_PROVIDER_ON_CREATED"/>
+  <int value="192" label="DELETED_NOTIFICATION_PROVIDER_ON_UPDATED"/>
   <int value="193" label="NOTIFICATIONS_ON_BUTTON_CLICKED"/>
   <int value="194" label="NOTIFICATIONS_ON_CLICKED"/>
   <int value="195" label="NOTIFICATIONS_ON_CLOSED"/>