Do not show apps section until default apps are installed.

chrome/browser/dom_ui/app_launcher_handler.cc

Index: chrome/browser/dom_ui/app_launcher_handler.cc
diff --git a/chrome/browser/dom_ui/app_launcher_handler.cc b/chrome/browser/dom_ui/app_launcher_handler.cc
index 01bffa9cea93ca62cbdacb37583c39790c17870c..ff7a6a01aab8cf9414902e0de8c5261ea14cdf0a 100644
--- a/chrome/browser/dom_ui/app_launcher_handler.cc
+++ b/chrome/browser/dom_ui/app_launcher_handler.cc
@@ -186,6 +186,16 @@ void AppLauncherHandler::FillAppDictionary(DictionaryValue* dictionary) {
   dictionary->SetBoolean("disableAppWindowLaunch", true);
   dictionary->SetBoolean("disableCreateAppShortcut", true);
 #endif
+
+  // We always show the launcher on Chrome OS. On Desktop Chrome, only show it
+  // if we've installed our default apps.
+#if defined(OS_CHROMEOS)
+  dictionary->SetBoolean("showLauncher", true);
+#else
+  dictionary->SetBoolean(
+      "showLauncher",
+      extensions_service_->default_apps()->GetDefaultAppsInstalled());
+#endif
 }
 
 void AppLauncherHandler::HandleGetApps(const ListValue* args) {