Remove last usage functions from HostContentSettingsMap and clean up prefs

chrome/browser/permissions/permission_context_base.cc

Index: chrome/browser/permissions/permission_context_base.cc
diff --git a/chrome/browser/permissions/permission_context_base.cc b/chrome/browser/permissions/permission_context_base.cc
index 4db37b31a4e90e14e1657b8408b735edc582dd7c..c8b35964949f5f7c3045d5089a37b1488d340d92 100644
--- a/chrome/browser/permissions/permission_context_base.cc
+++ b/chrome/browser/permissions/permission_context_base.cc
@@ -115,10 +115,6 @@ void PermissionContextBase::RequestPermission(
   // decision.
   PermissionResult result =
       GetPermissionStatus(requesting_origin, embedding_origin);
-  if (result.content_setting == CONTENT_SETTING_ALLOW) {
-    HostContentSettingsMapFactory::GetForProfile(profile_)->UpdateLastUsage(
-        requesting_origin, embedding_origin, content_settings_storage_type());
-  }
 
   if (result.content_setting == CONTENT_SETTING_ALLOW ||
       result.content_setting == CONTENT_SETTING_BLOCK) {