[Extensions] Remove JSONFeatureProvider, SimpleFeature::Parse

chrome/common/extensions/BUILD.gn

+# Copyright 2016 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.
+
+import("//build/config/features.gni")
+import("//tools/json_schema_compiler/json_features.gni")
+
+assert(enable_extensions)
+
+json_features("extension_features_unittest") {
+  feature_class = "APIFeature"
+  provider_class = "UnittestFeatureProvider"
+  sources = [
+    "//chrome/test/data/extensions/extension_api_unittest/api_features.json",
+  ]
+}
+
+group("test_features") {
+  public_deps = [
+    ":extension_features_unittest",
+  ]
+}