Disable New Incognito Window command for guest profile.

chrome/browser/ui/browser_command_controller.cc

Index: chrome/browser/ui/browser_command_controller.cc
diff --git a/chrome/browser/ui/browser_command_controller.cc b/chrome/browser/ui/browser_command_controller.cc
index 0c7943129f524cf44b86a6f05a28eb6d63be4ef9..886deca023e5671de6779134bfe563a650f0f497 100644
--- a/chrome/browser/ui/browser_command_controller.cc
+++ b/chrome/browser/ui/browser_command_controller.cc
@@ -15,6 +15,7 @@
 #include "chrome/browser/lifetime/application_lifetime.h"
 #include "chrome/browser/prefs/incognito_mode_prefs.h"
 #include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/sessions/tab_restore_service.h"
 #include "chrome/browser/sessions/tab_restore_service_factory.h"
 #include "chrome/browser/shell_integration.h"
@@ -1034,7 +1035,8 @@ void BrowserCommandController::UpdateSharedCommandsForIncognitoAvailability(
       incognito_availability != IncognitoModePrefs::FORCED);
   command_updater->UpdateCommandEnabled(
       IDC_NEW_INCOGNITO_WINDOW,
-      incognito_availability != IncognitoModePrefs::DISABLED);
+      incognito_availability != IncognitoModePrefs::DISABLED &&
+      profile->GetPath() != ProfileManager::GetGuestProfilePath());

[msw, 2014/09/25 21:20:06]

How and why is this condition different from the "guest_session =
profile->IsGuestSession();" immediately below?

[Mike Lerman, 2014/09/26 01:57:45]

They're the same. I'll use IsGuestSession().

 
   const bool guest_session = profile->IsGuestSession();
   const bool forced_incognito =