Move Extension into extensions namespace

chrome/browser/extensions/extension_sorting_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.
 
 #include "chrome/browser/extensions/extension_prefs_unittest.h"
 #include "chrome/browser/extensions/extension_sorting.h"
 #include "chrome/common/extensions/extension_manifest_constants.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+using extensions::Extension;
+
 namespace keys = extension_manifest_keys;
 
 class ExtensionSortingTest : public ExtensionPrefsTest {
  protected:
   ExtensionSorting* extension_sorting() {
     return prefs()->extension_sorting();
   }
 };
 
 class ExtensionSortingAppLocation : public ExtensionSortingTest {
@@ skipping 730 matching lines @@
     extension_sorting->SetPageOrdinal(app1_->id(), page_three);
     EXPECT_EQ(2, extension_sorting->PageStringOrdinalAsInteger(page_three));
 
     StringOrdinal page_six = extension_sorting->PageIntegerAsStringOrdinal(5);
     extension_sorting->SetPageOrdinal(app1_->id(), page_six);
     EXPECT_EQ(5, extension_sorting->PageStringOrdinalAsInteger(page_six));
   }
 };
 TEST_F(ExtensionSortingMakesFillerOrdinals,
        ExtensionSortingMakesFillerOrdinals) {}