[Extensions] Remove FeatureSwitch::easy_off_store_install

chrome/browser/download/download_crx_util.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // Download code which handles CRX files (extensions, themes, apps, ...).
 
 #ifndef CHROME_BROWSER_DOWNLOAD_DOWNLOAD_CRX_UTIL_H_
 #define CHROME_BROWSER_DOWNLOAD_DOWNLOAD_CRX_UTIL_H_
 
 #include <memory>
 
+#include "base/auto_reset.h"
 #include "base/memory/ref_counted.h"
 
 class ExtensionInstallPrompt;
 class Profile;
 
 namespace content {
 class DownloadItem;
 }
 
 namespace extensions {
@@ skipping 22 matching lines @@
 
 // Returns true if this is an extension download. This also considers user
 // scripts to be extension downloads, since we convert those automatically.
 bool IsExtensionDownload(const content::DownloadItem& download_item);
 
 // Checks whether an extension download should be allowed to proceed because the
 // installation site is whitelisted in prefs.
 bool OffStoreInstallAllowedByPrefs(Profile* profile,
                                    const content::DownloadItem& item);
 
+// Allows tests to override whether offstore extension installs are allowed
+// for testing purposes.
+std::unique_ptr<base::AutoReset<bool>> OverrideOffstoreInstallAllowedForTesting(
+    bool allowed);
+
 }  // namespace download_crx_util
 
 #endif  // CHROME_BROWSER_DOWNLOAD_DOWNLOAD_CRX_UTIL_H_