fix: make getUserMedia APIs work again on C72+ (backport: 5-0-x) (#16768)

* fix: resolve macos check for video and audio capture devices

* fix: resolve a minor compilation error

atom/browser/atom_browser_client.cc

@@ -82,6 +82,8 @@
 #include "net/ssl/client_cert_store_win.h"
 #elif defined(OS_MACOSX)
 #include "net/ssl/client_cert_store_mac.h"
+#include "services/audio/public/mojom/constants.mojom.h"
+#include "services/video_capture/public/mojom/constants.mojom.h"
 #elif defined(USE_OPENSSL)
 #include "net/ssl/client_cert_store.h"
 #endif
@@ -512,6 +514,16 @@ void AtomBrowserClient::AppendExtraCommandLineSwitches(
   }
 }
 
+void AtomBrowserClient::AdjustUtilityServiceProcessCommandLine(
+    const service_manager::Identity& identity,
+    base::CommandLine* command_line) {
+#if defined(OS_MACOSX)
+  if (identity.name() == video_capture::mojom::kServiceName ||
+      identity.name() == audio::mojom::kServiceName)
+    command_line->AppendSwitch(::switches::kMessageLoopTypeUi);
+#endif
+}
+
 void AtomBrowserClient::DidCreatePpapiPlugin(content::BrowserPpapiHost* host) {
 #if BUILDFLAG(ENABLE_PEPPER_FLASH)
   host->GetPpapiHost()->AddHostFactoryFilter(

atom/browser/atom_browser_client.h

@@ -85,6 +85,9 @@ class AtomBrowserClient : public content::ContentBrowserClient,
       content::SiteInstance* pending_site_instance) override;
   void AppendExtraCommandLineSwitches(base::CommandLine* command_line,
                                       int child_process_id) override;
+  void AdjustUtilityServiceProcessCommandLine(
+      const service_manager::Identity& identity,
+      base::CommandLine* command_line) override;
   void DidCreatePpapiPlugin(content::BrowserPpapiHost* browser_host) override;
   std::string GetGeolocationApiKey() override;
   content::QuotaPermissionContext* CreateQuotaPermissionContext() override;