WebContent: Remove stale on_webcontent_connection hook

Author: https://github.com/ADKaster
Commit: 7c607a4749
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/284
Reviewed-by: https://github.com/kalenikaliaksandr
Reviewed-by: https://github.com/trflynn89

Userland/Services/WebContent/PageClient.cpp

@@ -665,9 +665,6 @@ ErrorOr<void> PageClient::connect_to_webdriver(ByteString const& webdriver_ipc_p
     VERIFY(!m_webdriver);
     m_webdriver = TRY(WebDriverConnection::connect(*this, webdriver_ipc_path));
 
-    if (m_owner.on_webdriver_connection)
-        m_owner.on_webdriver_connection(*m_webdriver);
-
     return {};
 }