Clean up Chrome OS WARNING spam

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 a1a4f2dafc2728cf1d4f11fefc8a31734ab42ae0..ac5ad59e874d683f857a672b23b1b8eaaf8197ec 100644
--- a/chrome/browser/chromeos/login/ui/webui_login_view.cc
+++ b/chrome/browser/chromeos/login/ui/webui_login_view.cc
@@ -459,13 +459,12 @@ void WebUILoginView::DidFailProvisionalLoad(
 void WebUILoginView::OnLoginPromptVisible() {
   // If we're hidden than will generate this signal once we're shown.
   if (is_hidden_ || webui_visible_) {
-    LOG(WARNING) << "Login WebUI >> not emitting signal, hidden: "
-                 << is_hidden_;
+    VLOG(1) << "Login WebUI >> not emitting signal, hidden: " << is_hidden_;
     return;
   }
   TRACE_EVENT0("chromeos", "WebUILoginView::OnLoginPromoptVisible");
   if (should_emit_login_prompt_visible_) {
-    LOG(WARNING) << "Login WebUI >> login-prompt-visible";
+    VLOG(1) << "Login WebUI >> login-prompt-visible";
     chromeos::DBusThreadManager::Get()->GetSessionManagerClient()->
         EmitLoginPromptVisible();
   }