Implement DelegationTracker for tracking delegated permissions to RenderFrameHosts

chrome/browser/permissions/permission_manager.cc

Index: chrome/browser/permissions/permission_manager.cc
diff --git a/chrome/browser/permissions/permission_manager.cc b/chrome/browser/permissions/permission_manager.cc
index 550fde13b77a8acb8640ea5f000680245ce3c0cf..2b211ea55d9a67e416f7700bf2d7bb2e5553f5f9 100644
--- a/chrome/browser/permissions/permission_manager.cc
+++ b/chrome/browser/permissions/permission_manager.cc
@@ -317,11 +317,6 @@ int PermissionManager::RequestPermissions(
   return request_id;
 }
 
-std::size_t PermissionManager::PermissionTypeHash::operator()(
-    const content::PermissionType& type) const {
-  return static_cast<size_t>(type);
-}
-
 PermissionContextBase* PermissionManager::GetPermissionContext(
     PermissionType type) {
   const auto& it = permission_contexts_.find(type);