Remove dead code in media galleries file system registry.

chrome/browser/media_galleries/media_file_system_registry_unittest.cc

 // 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.
 
 // MediaFileSystemRegistry unit tests.
 
 #include <algorithm>
 #include <set>
 
 #include "base/bind_helpers.h"
@@ skipping 1028 matching lines @@
     ASSERT_TRUE(PathService::Get(chrome::DIR_USER_PICTURES, &path));
     profile_state->AddNameForAllCompare(GetExpectedFolderName(path));
     ASSERT_TRUE(PathService::Get(chrome::DIR_USER_VIDEOS, &path));
     profile_state->AddNameForAllCompare(GetExpectedFolderName(path));
 
     profile_state->CheckGalleries("names-dir", one_expectation, auto_galleries);
   } else {
     profile_state->CheckGalleries("names", one_expectation, one_expectation);
   }
 }
+
+TEST_F(MediaFileSystemRegistryTest, PreferenceListener) {
+  CreateProfileState(1);
+  AssertAllAutoAddedGalleries();
+
+  // Add a user gallery to the regular permission extension.
+  std::string device_id = AddUserGallery(StorageInfo::FIXED_MASS_STORAGE,
+                                         empty_dir().AsUTF8Unsafe(),
+                                         empty_dir());
+  ProfileState* profile_state = GetProfileState(0);
+  SetGalleryPermission(profile_state,
+                       profile_state->regular_permission_extension(),
+                       device_id,
+                       true /*has access*/);
+
+  FSInfoMap fs_info = profile_state->GetGalleriesInfo(
+      profile_state->regular_permission_extension());
+  ASSERT_EQ(1U, fs_info.size());
+  EXPECT_FALSE(test_file_system_context()->GetPathForId(
+      fs_info.begin()->second.fsid).empty());
+
+  // Revoke permission and ensure that the file system is revoked.
+  SetGalleryPermission(profile_state,
+                       profile_state->regular_permission_extension(),
+                       device_id,
+                       false /*has access*/);
+  EXPECT_TRUE(test_file_system_context()->GetPathForId(
+      fs_info.begin()->second.fsid).empty());
+}