Prevent incognito windows from opening when incognito mode is disabled.

chrome/browser/extensions/extension_tabs_module.cc

Index: chrome/browser/extensions/extension_tabs_module.cc
diff --git a/chrome/browser/extensions/extension_tabs_module.cc b/chrome/browser/extensions/extension_tabs_module.cc
index bf40f57dfd0080acbe758e307eb7221d9f0c08c1..ac6876356d262ef90f8e91fcd20e29e3360ddab8 100644
--- a/chrome/browser/extensions/extension_tabs_module.cc
+++ b/chrome/browser/extensions/extension_tabs_module.cc
@@ -387,17 +387,17 @@ bool CreateWindowFunction::RunImpl() {
       panel_bounds.set_height(bounds_val);
     }
 
+    const IncognitoModePrefs::Availability incognito_availability =
+        IncognitoModePrefs::GetAvailability(profile_->GetPrefs());
     bool incognito = false;
     if (args->HasKey(keys::kIncognitoKey)) {
       EXTENSION_FUNCTION_VALIDATE(args->GetBoolean(keys::kIncognitoKey,
                                                    &incognito));
-      if (IncognitoModePrefs::GetAvailability(profile_->GetPrefs()) ==
-          IncognitoModePrefs::DISABLED) {
-        error_ = keys::kIncognitoModeIsDisabled;
-        return false;
-      }
-
       if (incognito) {
+        if (incognito_availability == IncognitoModePrefs::DISABLED) {
+          error_ = keys::kIncognitoModeIsDisabled;
+          return false;
+        }
         std::string first_url_erased;
         // Guest session is an exception as it always opens in incognito mode.
         for (size_t i = 0; i < urls.size();) {
@@ -418,6 +418,10 @@ bool CreateWindowFunction::RunImpl() {
         window_profile = window_profile->GetOffTheRecordProfile();
       }
     }
+    if (!incognito && incognito_availability == IncognitoModePrefs::FORCED) {
+      error_ = keys::kIncognitoModeIsForced;
+      return false;
+    }
 
     if (args->HasKey(keys::kFocusedKey)) {
       EXTENSION_FUNCTION_VALIDATE(args->GetBoolean(keys::kFocusedKey,