Re-apply 192420: Move login switches to src/chromeos

chrome/browser/extensions/extension_system.cc

Index: chrome/browser/extensions/extension_system.cc
diff --git a/chrome/browser/extensions/extension_system.cc b/chrome/browser/extensions/extension_system.cc
index ecdebb36b86c6479726751c794e8556817454834..3831fa493da72612c506df286d5ae67ee9b667f3 100644
--- a/chrome/browser/extensions/extension_system.cc
+++ b/chrome/browser/extensions/extension_system.cc
@@ -50,6 +50,7 @@
 
 #if defined(OS_CHROMEOS)
 #include "chrome/browser/chromeos/login/user_manager.h"
+#include "chromeos/chromeos_switches.h"
 #endif
 
 using content::BrowserThread;
@@ -140,7 +141,8 @@ void ExtensionSystemImpl::Shared::Init(bool extensions_enabled) {
   if (!extensions_enabled)
     autoupdate_enabled = false;
   else
-    autoupdate_enabled = !command_line->HasSwitch(switches::kGuestSession);
+    autoupdate_enabled =
+        !command_line->HasSwitch(chromeos::switches::kGuestSession);
 #endif
   extension_service_.reset(new ExtensionService(
       profile_,