Revert of Simplify the registration of the Chrome Recovery component.

chrome/browser/chrome_browser_main.cc

Index: chrome/browser/chrome_browser_main.cc
diff --git a/chrome/browser/chrome_browser_main.cc b/chrome/browser/chrome_browser_main.cc
index 98690ba3dd2b51807e33f706e721f2a5bae8bede..0a1c5f7a82ef650404b01bb6ee28dcc9bb10ee71 100644
--- a/chrome/browser/chrome_browser_main.cc
+++ b/chrome/browser/chrome_browser_main.cc
@@ -468,14 +468,19 @@
 #endif  // defined(OS_MACOSX)
 
 void RegisterComponentsForUpdate() {
-  const auto cus = g_browser_process->component_updater();
-
+  component_updater::ComponentUpdateService* cus =
+      g_browser_process->component_updater();
+
+  // Registration can be before or after cus->Start() so it is ok to post
+  // a task to the UI thread to do registration once you done the necessary
+  // file IO to know you existing component version.
+#if !defined(OS_ANDROID)
+#if !defined(OS_CHROMEOS)
   if (base::FeatureList::IsEnabled(features::kImprovedRecoveryComponent))
     RegisterRecoveryImprovedComponent(cus, g_browser_process->local_state());
   else
     RegisterRecoveryComponent(cus, g_browser_process->local_state());
-
-#if !defined(OS_ANDROID)
+#endif  // !defined(OS_CHROMEOS)
   RegisterPepperFlashComponent(cus);
 #if !defined(OS_CHROMEOS)
   RegisterSwiftShaderComponent(cus);