Move Extension into extensions namespace

chrome/browser/background/background_application_list_model_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.
 
 // TODO(rickcam): Bug 73183: Add unit tests for image loading
 
 #include <cstdlib>
 #include <set>
 
 #include "chrome/browser/background/background_application_list_model.h"
@@ skipping 12 matching lines @@
 #include "chrome/test/base/testing_profile.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/notification_types.h"
 #include "content/test/test_browser_thread.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 // This value is used to seed the PRNG at the beginning of a sequence of
 // operations to produce a repeatable sequence.
 #define RANDOM_SEED (0x33F7A7A7)
 
+using extensions::Extension;
+
 // For ExtensionService interface when it requires a path that is not used.
 FilePath bogus_file_path() {
   return FilePath(FILE_PATH_LITERAL("//foobar_nonexistent"));
 }
 
 class BackgroundApplicationListModelTest : public ExtensionServiceTestBase {
  public:
   BackgroundApplicationListModelTest() {}
   virtual ~BackgroundApplicationListModelTest() {}
 
@@ skipping 307 matching lines @@
         break;
       case 2:
         TogglePermission(service, &extensions, model.get(), &expected, &count);
         break;
       default:
         NOTREACHED();
         break;
     }
   }
 }