Move Extension into extensions namespace

chrome/common/extensions/simple_feature_provider_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/common/extensions/simple_feature_provider.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 
+using extensions::Extension;
 using extensions::Feature;
 using extensions::SimpleFeatureProvider;
 
 TEST(SimpleFeatureProvider, ManifestFeatures) {
   SimpleFeatureProvider* provider =
       SimpleFeatureProvider::GetManifestFeatures();
   Feature* feature = provider->GetFeature("description");
   ASSERT_TRUE(feature);
   EXPECT_EQ(5u, feature->extension_types()->size());
   EXPECT_EQ(1u, feature->extension_types()->count(Extension::TYPE_EXTENSION));
@@ skipping 95 matching lines @@
   EXPECT_TRUE(provider->GetFeature("feature1"));
 
   // feature2 won't validate because of the presence of "contexts".
   EXPECT_FALSE(provider->GetFeature("feature2"));
 
   // If we remove it, it works.
   feature2->Remove("contexts", NULL);
   provider.reset(new SimpleFeatureProvider(value.get(), NULL));
   EXPECT_TRUE(provider->GetFeature("feature2"));
 }