Convert PrefHashFilter enums to enum class.

components/user_prefs/tracked/pref_hash_filter.h

 // Copyright 2013 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_USER_PREFS_TRACKED_PREF_HASH_FILTER_H_
 #define COMPONENTS_USER_PREFS_TRACKED_PREF_HASH_FILTER_H_
 
 #include <stddef.h>
 
 #include <map>
@@ skipping 27 matching lines @@
 
 namespace user_prefs {
 class PrefRegistrySyncable;
 }  // namespace user_prefs
 
 // Intercepts preference values as they are loaded from disk and verifies them
 // using a PrefHashStore. Keeps the PrefHashStore contents up to date as values
 // are changed.
 class PrefHashFilter : public InterceptablePrefFilter {
  public:
-  enum EnforcementLevel { NO_ENFORCEMENT, ENFORCE_ON_LOAD };
+  enum class EnforcementLevel { NO_ENFORCEMENT, ENFORCE_ON_LOAD };
 
-  enum PrefTrackingStrategy {
+  enum class PrefTrackingStrategy {
     // Atomic preferences are tracked as a whole.
-    TRACKING_STRATEGY_ATOMIC,
+    ATOMIC,
     // Split preferences are dictionaries for which each top-level entry is
     // tracked independently. Note: preferences using this strategy must be kept
     // in sync with TrackedSplitPreferences in histograms.xml.
-    TRACKING_STRATEGY_SPLIT,
+    SPLIT,
   };
 
-  enum ValueType {
-    VALUE_IMPERSONAL,
+  enum class ValueType {
+    IMPERSONAL,
     // The preference value may contain personal information.
-    VALUE_PERSONAL,
+    PERSONAL,
   };
 
   struct TrackedPreferenceMetadata {
     size_t reporting_id;
     const char* name;
     EnforcementLevel enforcement_level;
     PrefTrackingStrategy strategy;
     ValueType value_type;
   };
 
@@ skipping 99 matching lines @@
   // FilterSerializeData.
   ChangedPathsMap changed_paths_;
 
   // Whether to report the validity of the super MAC at load time (via UMA).
   bool report_super_mac_validity_;
 
   DISALLOW_COPY_AND_ASSIGN(PrefHashFilter);
 };
 
 #endif  // COMPONENTS_PREFS_TRACKED_PREF_HASH_FILTER_H_