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 c76e29cfbec4b0ca2cd33137a1dd52936e09c7a6..0ca63e6ef73f560bc53f769008c524d9ae2b88f6 100644
--- a/chrome/browser/permissions/permission_context_base.cc
+++ b/chrome/browser/permissions/permission_context_base.cc
@@ -109,10 +109,6 @@ void PermissionContextBase::RequestPermission(
   // decision.
   ContentSetting content_setting =
       GetPermissionStatus(requesting_origin, embedding_origin);
-  if (content_setting == CONTENT_SETTING_ALLOW) {
-    HostContentSettingsMapFactory::GetForProfile(profile_)->UpdateLastUsage(
-        requesting_origin, embedding_origin, content_settings_storage_type());
-  }
 
   if (content_setting == CONTENT_SETTING_ALLOW ||
       content_setting == CONTENT_SETTING_BLOCK) {