Make all ComplexFeatures of single feature to be SimpleFeature.

extensions/common/features/complex_feature.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/complex_feature.h"
 
 namespace extensions {
 
 ComplexFeature::ComplexFeature(std::vector<Feature*>* features) {
-  DCHECK_GT(features->size(), 0UL);
+  DCHECK_GT(features->size(), 1UL);
   for (Feature* f : *features)
     features_.push_back(std::unique_ptr<Feature>(f));
   features->clear();
   no_parent_ = features_[0]->no_parent();
 
 #if !defined(NDEBUG) || defined(DCHECK_ALWAYS_ON)
   // Verify IsInternal and no_parent is consistent across all features.
   bool first_is_internal = features_[0]->IsInternal();
   for (FeatureList::const_iterator it = features_.begin() + 1;
        it != features_.end();
@@ skipping 77 matching lines @@
   return false;
 }
 
 bool ComplexFeature::IsInternal() const {
   // Constructor verifies that composed features are consistent, thus we can
   // return just the first feature's value.
   return features_[0]->IsInternal();
 }
 
 }  // namespace extensions