Revert of Restrict use of two app-launching command line flags

chrome/browser/extensions/unpacked_installer.h

Index: chrome/browser/extensions/unpacked_installer.h
diff --git a/chrome/browser/extensions/unpacked_installer.h b/chrome/browser/extensions/unpacked_installer.h
index c0416a20bdfaf4d064afbfc91cdb926ca3e98aed..2bdc85eb931dbfbad8b2bc745a0b49060354461d 100644
--- a/chrome/browser/extensions/unpacked_installer.h
+++ b/chrome/browser/extensions/unpacked_installer.h
@@ -50,10 +50,8 @@
   // |extension_path| synchronously.
   // The return value indicates whether the installation has begun successfully.
   // The id of the extension being loaded is returned in |extension_id|.
-  // |only_allow_apps| is used to avoid side-loading of non-app extensions.
   bool LoadFromCommandLine(const base::FilePath& extension_path,
-                           std::string* extension_id,
-                           bool only_allow_apps);
+                           std::string* extension_id);
 
   // Allows prompting for plugins to be disabled; intended for testing only.
   bool prompt_for_plugins() { return prompt_for_plugins_; }