permissions: handle request ids for permissions in permission manager

chromecast/browser/cast_permission_manager.cc

Index: chromecast/browser/cast_permission_manager.cc
diff --git a/chromecast/browser/cast_permission_manager.cc b/chromecast/browser/cast_permission_manager.cc
index 047a6ff5a909f0cf85b1b390a77f767a6ab4beae..eaa6b940a03cf7ee1f6b241f678d5e312e58e691 100644
--- a/chromecast/browser/cast_permission_manager.cc
+++ b/chromecast/browser/cast_permission_manager.cc
@@ -18,15 +18,15 @@ CastPermissionManager::CastPermissionManager()
 CastPermissionManager::~CastPermissionManager() {
 }
 
-void CastPermissionManager::RequestPermission(
+int CastPermissionManager::RequestPermission(
     content::PermissionType permission,
     content::RenderFrameHost* render_frame_host,
-    int request_id,
     const GURL& origin,
     bool user_gesture,
     const base::Callback<void(content::PermissionStatus)>& callback) {
   LOG(INFO) << __FUNCTION__ << ": " << static_cast<int>(permission);
   callback.Run(content::PermissionStatus::PERMISSION_STATUS_GRANTED);
+  return kNoPendingOperation;
 }
 
 void CastPermissionManager::CancelPermissionRequest(
@@ -61,7 +61,7 @@ int CastPermissionManager::SubscribePermissionStatusChange(
     const GURL& requesting_origin,
     const GURL& embedding_origin,
     const base::Callback<void(content::PermissionStatus)>& callback) {
-  return -1;
+  return kNoPendingOperation;
 }
 
 void CastPermissionManager::UnsubscribePermissionStatusChange(