Don't run UI thread tasks after calling CefQuitMessageLoop

This avoids a situation where misbehaving clients may cause the
application to continue running indefinitely by posting new UI
thread tasks after calling CefQuitMessageLoop.

libcef/browser/main_runner.cc

@@ -273,8 +273,8 @@ void CefMainRunner::Shutdown(base::OnceClosure shutdown_on_ui_thread,
 void CefMainRunner::RunMessageLoop() {
   base::RunLoop run_loop;
 
-  DCHECK(quit_when_idle_callback_.is_null());
-  quit_when_idle_callback_ = run_loop.QuitWhenIdleClosure();
+  DCHECK(quit_callback_.is_null());
+  quit_callback_ = run_loop.QuitClosure();
 
   main_delegate_->BeforeMainMessageLoopRun(&run_loop);
 
@@ -283,11 +283,11 @@ void CefMainRunner::RunMessageLoop() {
 }
 
 void CefMainRunner::QuitMessageLoop() {
-  if (!quit_when_idle_callback_.is_null()) {
+  if (!quit_callback_.is_null()) {
     if (main_delegate_->HandleMainMessageLoopQuit()) {
       return;
     }
-    std::move(quit_when_idle_callback_).Run();
+    std::move(quit_callback_).Run();
   }
 }
 

libcef/browser/main_runner.h

@@ -89,7 +89,7 @@ class CefMainRunner : public CefMainRunnerHandler {
   std::unique_ptr<CefUIThread> ui_thread_;
 
   // Used to quit the current base::RunLoop.
-  base::OnceClosure quit_when_idle_callback_;
+  base::OnceClosure quit_callback_;
 };
 
 #endif  // CEF_LIBCEF_BROWSER_MAIN_RUNNER_H_

libcef/common/chrome/chrome_main_runner_delegate.cc

@@ -61,19 +61,19 @@ void ChromeMainRunnerDelegate::BeforeMainMessageLoopRun(
   keep_alive_ = std::make_unique<ScopedKeepAlive>(
       KeepAliveOrigin::APP_CONTROLLER, KeepAliveRestartOption::DISABLED);
 
-  // The idle callback will be executed from BrowserProcessImpl::Unpin() via
+  // The QuitClosure will be executed from BrowserProcessImpl::Unpin() via
   // KeepAliveRegistry when the last ScopedKeepAlive is released.
   // ScopedKeepAlives are also held by Browser objects.
   DCHECK(g_browser_process);
   static_cast<BrowserProcessImpl*>(g_browser_process)
-      ->SetQuitClosure(run_loop->QuitWhenIdleClosure());
+      ->SetQuitClosure(run_loop->QuitClosure());
 }
 
 bool ChromeMainRunnerDelegate::HandleMainMessageLoopQuit() {
   // May be called multiple times. See comments in RunMainMessageLoopBefore.
   keep_alive_.reset();
 
-  // Cancel direct execution of the QuitWhenIdleClosure() in
+  // Cancel direct execution of the QuitClosure() in
   // CefMainRunner::QuitMessageLoop. We instead wait for all Chrome browser
   // windows to exit.
   return true;