chore: drop thread_capabilities.patch (#29135)

patches/chromium/.patches

@@ -9,7 +9,6 @@ disable_hidden.patch
 dom_storage_limits.patch
 render_widget_host_view_base.patch
 render_widget_host_view_mac.patch
-thread_capabilities.patch
 webview_cross_drag.patch
 gin_enable_disable_v8_platform.patch
 disable-redraw-lock.patch

patches/chromium/thread_capabilities.patch

@@ -1,27 +0,0 @@
-From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
-From: Anonymous <anonymous@electronjs.org>
-Date: Thu, 20 Sep 2018 17:46:43 -0700
-Subject: thread_capabilities.patch
-
-Chromium automatically drops all capabilities of renderer threads in
-Linux, which may cause issues in a context like Electron, where the main
-and renderer threads are supposed to keep inherited permissions over the
-system.
-
-See https://github.com/atom/electron/issues/3666
-
-diff --git a/sandbox/linux/services/credentials.cc b/sandbox/linux/services/credentials.cc
-index d7b5d8c441354965ee0cb87a57d9552a4ae1f20d..dd145dd38fdbd7c426bd821baff0d9fe76201469 100644
---- a/sandbox/linux/services/credentials.cc
-+++ b/sandbox/linux/services/credentials.cc
-@@ -354,8 +354,10 @@ pid_t Credentials::ForkAndDropCapabilitiesInChild() {
-     return pid;
-   }
- 
-+#if 0
-   // Since we just forked, we are single threaded.
-   PCHECK(DropAllCapabilitiesOnCurrentThread());
-+#endif
-   return 0;
- }
-