Remove old-format PersistedLogs support

components/metrics/persisted_logs.h

 // 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.
 
 #ifndef COMPONENTS_METRICS_PERSISTED_LOGS_H_
 #define COMPONENTS_METRICS_PERSISTED_LOGS_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 37 matching lines @@
   // is longer than the lifetime of PersistedLogs.
   //
   // When saving logs to disk, stores either the first |min_log_count| logs, or
   // at least |min_log_bytes| bytes of logs, whichever is greater.
   //
   // If the optional |max_log_size| parameter is non-zero, all logs larger than
   // that limit will be skipped when writing to disk.
   PersistedLogs(std::unique_ptr<PersistedLogsMetrics> metrics,
                 PrefService* local_state,
                 const char* pref_name,
-                const char* outdated_pref_name,
                 size_t min_log_count,
                 size_t min_log_bytes,
                 size_t max_log_size);
   ~PersistedLogs();
 
   // Write list to storage.
   void SerializeLogs() const;
 
   // Reads the list from the preference.
   LogReadStatus DeserializeLogs();
@@ skipping 35 matching lines @@
   // True if there are no stored logs.
   bool empty() const { return list_.empty(); }
 
  private:
   // Writes the list to the ListValue.
   void WriteLogsToPrefList(base::ListValue* list) const;
 
   // Reads the list from the ListValue.
   LogReadStatus ReadLogsFromPrefList(const base::ListValue& list);
 
-  // Reads the list from the ListValue in the old Log-hash pair format.
-  LogReadStatus ReadLogsFromOldFormatPrefList(const base::ListValue& list);
-
   // An object for recording UMA metrics.
   std::unique_ptr<PersistedLogsMetrics> metrics_;
 
   // A weak pointer to the PrefService object to read and write the preference
   // from.  Calling code should ensure this object continues to exist for the
   // lifetime of the PersistedLogs object.
   PrefService* local_state_;
 
   // The name of the preference to serialize logs to/from.
   const char* pref_name_;
 
-  // The name of the preference to serialize logs to/from which may contain log
-  // in the old formatting.
-  const char* outdated_pref_name_;
-
   // We will keep at least this |min_log_count_| logs or |min_log_bytes_| bytes
   // of logs, whichever is greater, when writing to disk.  These apply after
   // skipping logs greater than |max_log_size_|.
   const size_t min_log_count_;
   const size_t min_log_bytes_;
 
   // Logs greater than this size will not be written to disk.
   const size_t max_log_size_;
 
   struct LogInfo {
@@ skipping 20 matching lines @@
   // The index and type of the log staged for upload. If nothing has been
   // staged, the index will be -1.
   int staged_log_index_;
 
   DISALLOW_COPY_AND_ASSIGN(PersistedLogs);
 };
 
 }  // namespace metrics
 
 #endif  // COMPONENTS_METRICS_PERSISTED_LOGS_H_