[iOS] Remove ChromeBrowserState::ExitType (dead code)

ios/chrome/browser/application_context_impl.cc

Index: ios/chrome/browser/application_context_impl.cc
diff --git a/ios/chrome/browser/application_context_impl.cc b/ios/chrome/browser/application_context_impl.cc
index e81f9be94ed6bb12bb392f67e11aad3e84521124..1fc9d9f4e0a1590fe735c8347f4dd52eb3156730 100644
--- a/ios/chrome/browser/application_context_impl.cc
+++ b/ios/chrome/browser/application_context_impl.cc
@@ -85,12 +85,6 @@ void ApplicationContextImpl::OnAppEnterForeground() {
   variations::VariationsService* variations_service = GetVariationsService();
   if (variations_service)
     variations_service->OnAppEnterForeground();
-
-  std::vector<ios::ChromeBrowserState*> loaded_browser_state =
-      GetChromeBrowserStateManager()->GetLoadedBrowserStates();
-  for (ios::ChromeBrowserState* browser_state : loaded_browser_state) {
-    browser_state->SetExitType(ios::ChromeBrowserState::EXIT_CRASHED);
-  }
 }
 
 void ApplicationContextImpl::OnAppEnterBackground() {
@@ -105,7 +99,6 @@ void ApplicationContextImpl::OnAppEnterBackground() {
       history_service->HandleBackgrounding();
     }
 
-    browser_state->SetExitType(ios::ChromeBrowserState::EXIT_NORMAL);
     PrefService* browser_state_prefs = browser_state->GetPrefs();
     if (browser_state_prefs)
       browser_state_prefs->CommitPendingWrite();