[Extensions] Add extension feature generation code

chrome/common/extensions/api/common_extension_api_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 "extensions/common/extension_api.h"
 
 #include <stddef.h>
 
 #include <memory>
 #include <string>
@@ skipping 648 matching lines @@
     // TODO(aa): More stuff to test over time.
   } test_data[] = {
     { bookmarks },
     { bookmarks_create }
   };
 
   for (size_t i = 0; i < arraysize(test_data); ++i) {
     SimpleFeature* feature = test_data[i].feature;
     ASSERT_TRUE(feature) << i;
 
-    EXPECT_TRUE(feature->whitelist()->empty());
-    EXPECT_TRUE(feature->extension_types()->empty());
+    EXPECT_TRUE(feature->whitelist().empty());
+    EXPECT_TRUE(feature->extension_types().empty());
 
     EXPECT_EQ(SimpleFeature::UNSPECIFIED_LOCATION, feature->location());
-    EXPECT_TRUE(feature->platforms()->empty());
+    EXPECT_TRUE(feature->platforms().empty());
     EXPECT_EQ(0, feature->min_manifest_version());
     EXPECT_EQ(0, feature->max_manifest_version());
   }
 }
 
 TEST(ExtensionAPITest, JSONFeatureProviderDoesNotStoreInvalidFeatures) {
   base::DictionaryValue features;
   std::unique_ptr<base::DictionaryValue> feature_value(
       new base::DictionaryValue());
   // This feature is invalid (it needs an extension context), so the
@@ skipping 151 matching lines @@
                                          extension.get(),
                                          Feature::BLESSED_EXTENSION_CONTEXT,
                                          GURL()).is_available());
   EXPECT_FALSE(extension_api->IsAvailable("pageAction",
                                           extension.get(),
                                           Feature::BLESSED_EXTENSION_CONTEXT,
                                           GURL()).is_available());
 }
 
 }  // namespace extensions