LibCore: Remove main event loop

The main event loop functionality was used in just two places where the
alternative is a bit simpler. Remove it in favor of referencing the
event loop directly, or just invoking `EventLoop::current()`.

Note that we don't need locking in the constructor since we're now only
modifying a thread-local `Vector`. We also don't need locking in the
old call sites to `::with_main_locked()` since we already lock the
event loop in the subsequent `::post_event()` invocation.

2 files changed, 5 insertions, 7 deletions

diff --git a/Userland/Applications/CrashReporter/main.cpp b/Userland/Applications/CrashReporter/main.cpp
index e7993e7874..9a956b3970 100644
--- a/Userland/Applications/CrashReporter/main.cpp
+++ b/Userland/Applications/CrashReporter/main.cpp
@@ -298,12 +298,10 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
             size_t thread_index = 0;
             coredump->for_each_thread_info([&](auto& thread_info) {
                 results.thread_backtraces.append(build_backtrace(*coredump, thread_info, thread_index, [&](size_t frame_index, size_t frame_count) {
-                    Core::EventLoop::with_main_locked([&](auto& main) {
-                        main->deferred_invoke([&, frame_index, frame_count] {
-                            window->set_progress(100.0f * (float)(frame_index + 1) / (float)frame_count);
-                            progressbar.set_value(frame_index + 1);
-                            progressbar.set_max(frame_count);
-                        });
+                    app->event_loop().deferred_invoke([&, frame_index, frame_count] {
+                        window->set_progress(100.0f * (float)(frame_index + 1) / (float)frame_count);
+                        progressbar.set_value(frame_index + 1);
+                        progressbar.set_max(frame_count);
                     });
                 }));
                 results.thread_cpu_registers.append(build_cpu_registers(thread_info, thread_index));
diff --git a/Userland/Applications/SystemMonitor/ThreadStackWidget.cpp b/Userland/Applications/SystemMonitor/ThreadStackWidget.cpp
index 998cb50868..3c025499aa 100644
--- a/Userland/Applications/SystemMonitor/ThreadStackWidget.cpp
+++ b/Userland/Applications/SystemMonitor/ThreadStackWidget.cpp
@@ -123,7 +123,7 @@ void ThreadStackWidget::refresh()
         [weak_this = make_weak_ptr()](auto result) {
             if (!weak_this)
                 return;
-            Core::EventLoop::with_main_locked([&](auto* main_event_loop) { main_event_loop->post_event(const_cast<Core::Object&>(*weak_this), make<CompletionEvent>(move(result))); });
+            Core::EventLoop::current().post_event(const_cast<Core::Object&>(*weak_this), make<CompletionEvent>(move(result)));
         });
 }