chore: remove content_browser_main_loop.patch

Refs: https://chromium-review.googlesource.com/c/chromium/src/+/2725153

The function being patched (BrowserMainLoop::MainMessageLoopRun()) no
longer exists.

NB: if removing this introduces regressions the likely fix will be to
add a similar patch for ShellBrowserMainParts::WillRunMainMessageLoop()
which has similar code and was added at the same time this was removed.

patches/chromium/.patches

@@ -41,7 +41,6 @@ proxy_config_monitor.patch
 gritsettings_resource_ids.patch
 isolate_holder.patch
 notification_provenance.patch
-content_browser_main_loop.patch
 dump_syms.patch
 command-ismediakey.patch
 printing.patch

patches/chromium/content_browser_main_loop.patch

@@ -1,22 +0,0 @@
-From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
-From: deepak1556 <hop2deep@gmail.com>
-Date: Thu, 18 Oct 2018 17:07:42 -0700
-Subject: content_browser_main_loop.patch
-
-Pass idle quit closure for main message loop, so that pending tasks are
-run before shutdown. This is required to cleanup WebContents asynchronously
-in electron::api::WebContents::ResetManagedWebContents.
-
-diff --git a/content/browser/browser_main_loop.cc b/content/browser/browser_main_loop.cc
-index 72693b82f5c4bcd0b5151e97820ec2de9662670c..dba51b8cdd420f8fecc45dff2a92a3110435c737 100644
---- a/content/browser/browser_main_loop.cc
-+++ b/content/browser/browser_main_loop.cc
-@@ -1413,7 +1413,7 @@ void BrowserMainLoop::MainMessageLoopRun() {
-   NOTREACHED();
- #else
-   base::RunLoop run_loop;
--  parts_->PreDefaultMainMessageLoopRun(run_loop.QuitClosure());
-+  parts_->PreDefaultMainMessageLoopRun(run_loop.QuitWhenIdleClosure());
-   run_loop.Run();
- #endif
- }