Updating FeatureList default initialization pattern

base/feature_list.h

Index: base/feature_list.h
diff --git a/base/feature_list.h b/base/feature_list.h
index 2a47427fb268e6d63cba9005fb31727ed326aa2f..e9ed00a124ad8f701d05391ede500e0c5f84138b 100644
--- a/base/feature_list.h
+++ b/base/feature_list.h
@@ -247,10 +247,10 @@ class BASE_EXPORT FeatureList {
 
   // 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);
 };