updater: change message type of task executor for the COM service.

Fixed: 1476235

Change-Id: Ie0137053bac5ded01f445f36e6fa843e494e8bed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4815190
Reviewed-by: S Ganesh <ganesh@chromium.org>
Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com>
Commit-Queue: S Ganesh <ganesh@chromium.org>
Auto-Submit: Sorin Jianu <sorin@chromium.org>
Commit-Queue: Sorin Jianu <sorin@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1188709}

chrome/updater/app/server/win/service_main.cc

@@ -174,21 +174,17 @@ HRESULT ServiceMain::Run(const base::CommandLine& command_line) {
 
 HRESULT ServiceMain::RunCOMServer() {
   base::SingleThreadTaskExecutor service_task_executor(
-      base::MessagePumpType::UI);
-
-  // Initialize COM for the current thread.
+      base::MessagePumpType::DEFAULT);
   base::win::ScopedCOMInitializer com_initializer(
       base::win::ScopedCOMInitializer::kMTA);
   if (!com_initializer.Succeeded()) {
     LOG(ERROR) << "Failed to initialize COM";
     return CO_E_INITIALIZATIONFAILED;
   }
-
   HRESULT hr = InitializeComSecurity();
   if (FAILED(hr)) {
     return hr;
   }
-
   return GetAppServerWinInstance()->Run();
 }