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..46151f0f90c0d5e569119c43782d4b460a98636d 100644
--- a/chrome/browser/permissions/permission_manager.cc
+++ b/chrome/browser/permissions/permission_manager.cc
@@ -24,7 +24,6 @@
 #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"
@@ -317,11 +316,6 @@ 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);