Replace FOR_EACH_OBSERVER in c/b/chromeos with range-based for

chrome/browser/chromeos/login/ui/webui_login_view.cc

Index: chrome/browser/chromeos/login/ui/webui_login_view.cc
diff --git a/chrome/browser/chromeos/login/ui/webui_login_view.cc b/chrome/browser/chromeos/login/ui/webui_login_view.cc
index e8355fe2dbca45c0274bfce74af68dde6472e33d..01224657e93178732f438b9974300097d17ada59 100644
--- a/chrome/browser/chromeos/login/ui/webui_login_view.cc
+++ b/chrome/browser/chromeos/login/ui/webui_login_view.cc
@@ -233,9 +233,8 @@ WebUILoginView::WebUILoginView()
 }
 
 WebUILoginView::~WebUILoginView() {
-  FOR_EACH_OBSERVER(web_modal::ModalDialogHostObserver,
-                    observer_list_,
-                    OnHostDestroying());
+  for (auto& observer : observer_list_)
+    observer.OnHostDestroying();
 
   if (!chrome::IsRunningInMash() &&
       ash::Shell::GetInstance()->HasPrimaryStatusArea()) {
@@ -443,9 +442,8 @@ void WebUILoginView::Layout() {
   DCHECK(webui_login_);
   webui_login_->SetBoundsRect(bounds());
 
-  FOR_EACH_OBSERVER(web_modal::ModalDialogHostObserver,
-                    observer_list_,
-                    OnPositionRequiresUpdate());
+  for (auto& observer : observer_list_)
+    observer.OnPositionRequiresUpdate();
 }
 
 void WebUILoginView::OnLocaleChanged() {