ExtensionsServiceBackend::GarbageCollectionExtensions() makes a local copy of install_directory_

chrome/browser/extensions/extensions_service_unittest.cc

 // Copyright (c) 2006-2009 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.
 
 #include <algorithm>
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
@@ skipping 1209 matching lines @@
   loop_.RunAllPending();
   ASSERT_EQ(0u, loaded_.size());
   ValidatePrefKeyCount(0);
 
   // The extension should also be gone from the install directory.
   ASSERT_FALSE(file_util::PathExists(install_path));
 }
 
 #endif
 
-// TODO(rafaelw): Re-enable on mac. This broke with:
-// http://codereview.chromium.org/140018
-#if !defined(OS_MACOSX)
-
 TEST_F(ExtensionsServiceTest, ExternalInstallPref) {
   InitializeEmptyExtensionsService();
   // Verify that starting with no providers loads no extensions.
   service_->Init();
   loop_.RunAllPending();
   ASSERT_EQ(0u, loaded_.size());
 
   // Now add providers. Extension system takes ownership of the objects.
   MockExtensionProvider* pref_provider =
       new MockExtensionProvider(Extension::EXTERNAL_PREF);
@@ skipping 93 matching lines @@
   pref_provider->UpdateOrAddExtension(good_crx, "1.0", source_path);
   service_->CheckForUpdates();
   loop_.RunAllPending();
 
   ASSERT_EQ(0u, loaded_.size());
   ASSERT_EQ(1u, GetErrors().size());
   ASSERT_TRUE(GetErrors()[0].find("Extensions are not enabled") !=
               std::string::npos);
 }
 
-#endif  // !defined(OS_MACOSX)
-
 TEST_F(ExtensionsServiceTest, ExternalPrefProvider) {
   InitializeEmptyExtensionsService();
   std::string json_data =
       "{"
         "\"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\": {"
           "\"external_crx\": \"RandomExtension.crx\","
           "\"external_version\": \"1.0\""
         "},"
         "\"bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb\": {"
           "\"external_crx\": \"RandomExtension2.crx\","
@@ skipping 107 matching lines @@
 
   recorder.set_ready(false);
   command_line.reset(new CommandLine(L""));
   service = new ExtensionsService(&profile, command_line.get(),
       profile.GetPrefs(), install_dir, &loop, &loop);
   EXPECT_TRUE(service->extensions_enabled());
   service->Init();
   loop.RunAllPending();
   EXPECT_TRUE(recorder.ready());
 }