Remove code to defer app window appearance until first paint.

extensions/common/switches.cc

Index: extensions/common/switches.cc
diff --git a/extensions/common/switches.cc b/extensions/common/switches.cc
index 1545442b9c0589dc12d06a0b7c9000d7cb5cf819..1879b8792934613c429932c34cba0bc945e72a3c 100644
--- a/extensions/common/switches.cc
+++ b/extensions/common/switches.cc
@@ -20,11 +20,6 @@ const char kAllowLegacyExtensionManifests[] =
 // a new tab.
 const char kEmbeddedExtensionOptions[] = "embedded-extension-options";
 
-// Show apps windows after the first paint. Windows will be shown significantly
-// later for heavy apps loading resources synchronously but it will be
-// insignificant for apps that load most of their resources asynchronously.
-const char kEnableAppsShowOnFirstPaint[] = "enable-apps-show-on-first-paint";
-
 // Enables the <window-controls> tag in platform apps.
 const char kEnableAppWindowControls[] = "enable-app-window-controls";