Pass a Feature* to IsAnyFeatureAvailableToContext instead of a string name.

chrome/common/extensions/features/base_feature_provider.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/features/base_feature_provider.h"
 
 #include <stack>
 
 #include "base/json/json_reader.h"
 #include "base/lazy_instance.h"
@@ skipping 170 matching lines @@
 
 BaseFeatureProvider::~BaseFeatureProvider() {
 }
 
 // static
 FeatureProvider* BaseFeatureProvider::GetByName(
     const std::string& name) {
   return g_static.Get().GetFeatures(name);
 }
 
-const std::vector<std::string>& BaseFeatureProvider::GetAllFeatureNames() {
+const std::vector<std::string>& BaseFeatureProvider::GetAllFeatureNames()
+    const {
   if (feature_names_.empty()) {
     for (FeatureMap::const_iterator iter = features_.begin();
          iter != features_.end(); ++iter) {
       feature_names_.push_back(iter->first);
     }
   }
   return feature_names_;
 }
 
-Feature* BaseFeatureProvider::GetFeature(const std::string& name) {
-  FeatureMap::iterator iter = features_.find(name);
+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 NULL;
 }
 
-Feature* BaseFeatureProvider::GetParent(Feature* feature) {
+Feature* BaseFeatureProvider::GetParent(Feature* feature) const {
   CHECK(feature);
   if (feature->no_parent())
     return NULL;
 
   std::vector<std::string> split;
   base::SplitString(feature->name(), '.', &split);
   if (split.size() < 2)
     return NULL;
   split.pop_back();
   return GetFeature(JoinString(split, '.'));
 }
 
 } // namespace extensions