Move Extension into extensions namespace

chrome/common/extensions/extension_set_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 "base/file_path.h"
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/values.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/extensions/extension_set.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+using extensions::Extension;
+
 namespace {
 
 scoped_refptr<Extension> CreateTestExtension(const std::string& name,
                                              const std::string& launch_url,
                                              const std::string& extent) {
 #if defined(OS_WIN)
   FilePath path(FILE_PATH_LITERAL("c:\\"));
 #else
   FilePath path(FILE_PATH_LITERAL("/"));
 #endif
@@ skipping 101 matching lines @@
   to_add->Insert(ext5);
   to_add->Insert(ext6);
 
   ASSERT_TRUE(extensions.Contains(ext3->id()));
   ASSERT_TRUE(extensions.InsertAll(*to_add));
   EXPECT_EQ(4u, extensions.size());
 
   ASSERT_FALSE(extensions.InsertAll(*to_add));  // Re-adding same set no-ops.
   EXPECT_EQ(4u, extensions.size());
 }