Clean-up the code for default variations in chrome://flags.

components/flags_ui/feature_entry.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 COMPONENTS_FLAGS_UI_FEATURE_ENTRY_H_
 #define COMPONENTS_FLAGS_UI_FEATURE_ENTRY_H_
 
 #include <string>
 
 #include "base/strings/string16.h"
@@ skipping 32 matching lines @@
     // flags - for example via FieldTrials.
     ENABLE_DISABLE_VALUE,
 
     // Corresponds to a base::Feature, per base/feature_list.h. The entry will
     // have three states: Default, Enabled, Disabled. When not specified or set
     // to Default, the normal default value of the feature is used.
     FEATURE_VALUE,
 
     // Corresponds to a base::Feature and additional options [O_1, ..., O_n]
     // that specify variation parameters. Each of the options can specify a set
-    // of variation parameters. The entry will have n+2 states: Default,
-    // Enabled: V_1, ..., Enabled: V_n, Disabled. When not specified or set to
-    // Default, the normal default values of the feature and of the parameters
-    // are used.
+    // of variation parameters. The entry will have n+3 states: Default,
+    // Enabled, Enabled V_1, ..., Enabled: V_n, Disabled. When set to Default,
+    // the normal default values of the feature and of the parameters are used
+    // (possibly passed from the server in a trial config). When set to Enabled,
+    // the feature is overriden to be enabled and empty set of parameters is
+    // used boiling down to the default behavior in the code.
     FEATURE_WITH_VARIATIONS_VALUE,
   };
 
   // Describes state of a feature.
   enum FeatureState {
     // The state of the feature is not overridden by the user.
     DEFAULT,
     // The feature is enabled by the user.
     ENABLED,
     // The feature is disabled by the user.
@@ skipping 110 matching lines @@
 
 // Separator used for multi values. Multi values are represented in prefs as
 // name-of-experiment + kMultiSeparator + selected_index.
 extern const char kMultiSeparator[];
 
 }  // namespace
 
 }  // namespace flag_ui
 
 #endif  // COMPONENTS_FLAGS_UI_FEATURE_ENTRY_H_