[Extensions] Remove FeatureSwitch::easy_off_store_install

chrome/browser/download/download_crx_util.h

Index: chrome/browser/download/download_crx_util.h
diff --git a/chrome/browser/download/download_crx_util.h b/chrome/browser/download/download_crx_util.h
index cd84fab551dd0afcbd05923ae661321eb3376e41..b80ccd6a82ef40118616381b69dc1411b058a158 100644
--- a/chrome/browser/download/download_crx_util.h
+++ b/chrome/browser/download/download_crx_util.h
@@ -9,6 +9,7 @@
 
 #include <memory>
 
+#include "base/auto_reset.h"
 #include "base/memory/ref_counted.h"
 
 class ExtensionInstallPrompt;
@@ -51,6 +52,11 @@ bool IsExtensionDownload(const content::DownloadItem& download_item);
 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_