[Extensions] Remove BaseFeatureProvider

extensions/common/features/base_feature_provider.cc

-// Copyright 2014 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/features/base_feature_provider.h"
-
-#include <utility>
-
-#include "base/strings/string_split.h"
-#include "base/strings/string_util.h"
-#include "extensions/common/features/feature.h"
-
-namespace extensions {
-
-BaseFeatureProvider::BaseFeatureProvider() {}
-BaseFeatureProvider::~BaseFeatureProvider() {}
-
-const FeatureMap& BaseFeatureProvider::GetAllFeatures() const {
-  return features_;
-}
-
-Feature* BaseFeatureProvider::GetFeature(const std::string& name) const {
-  FeatureMap::const_iterator iter = features_.find(name);
-  if (iter != features_.end())
-    return iter->second.get();
-  else
-    return nullptr;
-}
-
-Feature* BaseFeatureProvider::GetParent(Feature* feature) const {
-  CHECK(feature);
-  if (feature->no_parent())
-    return nullptr;
-
-  std::vector<std::string> split = base::SplitString(
-      feature->name(), ".", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
-  if (split.size() < 2)
-    return nullptr;
-  split.pop_back();
-  return GetFeature(base::JoinString(split, "."));
-}
-
-// Children of a given API are named starting with parent.name()+".", which
-// means they'll be contiguous in the features_ std::map.
-std::vector<Feature*> BaseFeatureProvider::GetChildren(const Feature& parent)
-    const {
-  std::string prefix = parent.name() + ".";
-  const FeatureMap::const_iterator first_child = features_.lower_bound(prefix);
-
-  // All children have names before (parent.name() + ('.'+1)).
-  ++prefix.back();
-  const FeatureMap::const_iterator after_children =
-      features_.lower_bound(prefix);
-
-  std::vector<Feature*> result;
-  result.reserve(std::distance(first_child, after_children));
-  for (FeatureMap::const_iterator it = first_child; it != after_children;
-       ++it) {
-    result.push_back(it->second.get());
-  }
-  return result;
-}
-
-void BaseFeatureProvider::AddFeature(base::StringPiece name,
-                                     std::unique_ptr<Feature> feature) {
-  features_[name.as_string()] = std::move(feature);
-}
-
-void BaseFeatureProvider::AddFeature(base::StringPiece name, Feature* feature) {
-  features_[name.as_string()] = std::unique_ptr<Feature>(feature);
-}
-
-}  // namespace extensions