Implement DelegationTracker for tracking delegated permissions to RenderFrameHosts

chrome/browser/permissions/permission_manager.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/permissions/permission_manager.h"
 
 #include <stddef.h>
 
 #include "base/callback.h"
 #include "base/memory/ptr_util.h"
@@ skipping 299 matching lines @@
                 weak_ptr_factory_.GetWeakPtr(), request_id, i)));
   }
 
   // The request might have been resolved already.
   if (!pending_requests_.Lookup(request_id))
     return kNoPendingOperation;
 
   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);
   return it == permission_contexts_.end() ? nullptr : it->second.get();
 }
 
 void PermissionManager::OnPermissionsRequestResponseStatus(
     int request_id,
     int permission_id,
     PermissionStatus status) {
@@ skipping 140 matching lines @@
     // Add the callback to |callbacks| which will be run after the loop to
     // prevent re-entrance issues.
     callbacks.push_back(
         base::Bind(subscription->callback,
                    ContentSettingToPermissionStatus(new_value)));
   }
 
   for (const auto& callback : callbacks)
     callback.Run();
 }