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 bad0233269519ee55361667b5b8253d1b4503e25..73ad13170e2022b3bcfc8ace69ed31a111a3a799 100644
--- a/chrome/browser/permissions/permission_manager.cc
+++ b/chrome/browser/permissions/permission_manager.cc
@@ -23,7 +23,6 @@
 #include "chrome/browser/tab_contents/tab_util.h"
 #include "chrome/common/features.h"
 #include "components/content_settings/core/browser/host_content_settings_map.h"
-#include "content/public/browser/permission_type.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/web_contents.h"
@@ -313,11 +312,6 @@ 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);