Fix for ERROR:url_pattern_set.cc(240)] Invalid url pattern: chrome://print/*

chrome/browser/extensions/test_extension_prefs.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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_TEST_EXTENSION_PREFS_H_
 #define CHROME_BROWSER_EXTENSIONS_TEST_EXTENSION_PREFS_H_
 
 #include <string>
 
 #include "base/files/scoped_temp_dir.h"
@@ skipping 60 matching lines @@
   scoped_refptr<Extension> AddExtensionWithManifestAndFlags(
       const base::DictionaryValue& manifest,
       Manifest::Location location,
       int extra_flags);
 
   // Similar to AddExtension, this adds a new test Extension. This is useful for
   // cases when you don't need the Extension object, but just the id it was
   // assigned.
   std::string AddExtensionAndReturnId(const std::string& name);
 
+  // This will add extension in our ExtensionPrefs.
+  void AddExtension(Extension* extension);
+
   PrefService* CreateIncognitoPrefService() const;
 
   // Allows disabling the loading of preferences of extensions. Becomes
   // active after calling RecreateExtensionPrefs(). Defaults to false.
   void set_extensions_disabled(bool extensions_disabled);
 
  protected:
   base::ScopedTempDir temp_dir_;
   base::FilePath preferences_file_;
   base::FilePath extensions_dir_;
   scoped_refptr<user_prefs::PrefRegistrySyncable> pref_registry_;
   scoped_ptr<PrefServiceSyncable> pref_service_;
   scoped_ptr<ExtensionPrefs> prefs_;
   scoped_ptr<ExtensionPrefValueMap> extension_pref_value_map_;
   const scoped_refptr<base::SequencedTaskRunner> task_runner_;
 
  private:
   bool extensions_disabled_;
   DISALLOW_COPY_AND_ASSIGN(TestExtensionPrefs);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_TEST_EXTENSION_PREFS_H_