Updating FeatureList default initialization pattern

base/feature_list.h

 // Copyright 2015 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.
 
 #ifndef BASE_FEATURE_LIST_H_
 #define BASE_FEATURE_LIST_H_
 
 #include <map>
 #include <memory>
 #include <string>
@@ skipping 229 matching lines @@
   std::map<std::string, OverrideEntry> overrides_;
 
   // Locked map that keeps track of seen features, to ensure a single feature is
   // only defined once. This verification is only done in builds with DCHECKs
   // enabled.
   Lock feature_identity_tracker_lock_;
   std::map<std::string, const Feature*> feature_identity_tracker_;
 
   // Whether this object has been fully initialized. This gets set to true as a
   // result of FinalizeInitialization().
-  bool initialized_;
+  bool initialized_ = false;
 
   // Whether this object has been initialized from command line.
-  bool initialized_from_command_line_;
+  bool initialized_from_command_line_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(FeatureList);
 };
 
 }  // namespace base
 
 #endif  // BASE_FEATURE_LIST_H_