Implement DelegationTracker for tracking delegated permissions to RenderFrameHosts

chrome/browser/permissions/permission_manager.h

Index: chrome/browser/permissions/permission_manager.h
diff --git a/chrome/browser/permissions/permission_manager.h b/chrome/browser/permissions/permission_manager.h
index 3e7731470164cbfdbdcd45253a8b23a9ae4b4517..91fcff5a5039b6282de6b1ab81f8342376fec0cf 100644
--- a/chrome/browser/permissions/permission_manager.h
+++ b/chrome/browser/permissions/permission_manager.h
@@ -15,12 +15,12 @@
 #include "components/content_settings/core/common/content_settings.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "content/public/browser/permission_manager.h"
+#include "content/public/browser/permission_type.h"
 
 class PermissionContextBase;
 class Profile;
 
 namespace content {
-enum class PermissionType;
 class WebContents;
 };  // namespace content
 
@@ -78,10 +78,6 @@ class PermissionManager : public KeyedService,
   struct Subscription;
   using SubscriptionsMap = IDMap<Subscription, IDMapOwnPointer>;
 
-  struct PermissionTypeHash {
-    std::size_t operator()(const content::PermissionType& type) const;
-  };
-
   PermissionContextBase* GetPermissionContext(content::PermissionType type);
 
   // Called when a permission was decided for a given PendingRequest. The
@@ -107,7 +103,7 @@ class PermissionManager : public KeyedService,
 
   std::unordered_map<content::PermissionType,
                      std::unique_ptr<PermissionContextBase>,
-                     PermissionTypeHash>
+                     content::PermissionTypeHash>
       permission_contexts_;
 
   base::WeakPtrFactory<PermissionManager> weak_ptr_factory_;