[Extensions] Add extension feature generation code

chrome/common/extensions/api/common_extension_api_unittest.cc

Index: chrome/common/extensions/api/common_extension_api_unittest.cc
diff --git a/chrome/common/extensions/api/common_extension_api_unittest.cc b/chrome/common/extensions/api/common_extension_api_unittest.cc
index edcb0b37c76c747d645bbf6873ad59e00e246da1..1eccf951dc43d11157deff4ff5ad90ea12381e78 100644
--- a/chrome/common/extensions/api/common_extension_api_unittest.cc
+++ b/chrome/common/extensions/api/common_extension_api_unittest.cc
@@ -666,11 +666,11 @@ TEST(ExtensionAPITest, DefaultConfigurationFeatures) {
     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());
   }