Remove old-format PersistedLogs support

components/metrics/persisted_logs_unittest.cc

 // 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.
 
 #include "components/metrics/persisted_logs.h"
 
 #include <stddef.h>
 
 #include "base/base64.h"
 #include "base/macros.h"
 #include "base/rand_util.h"
 #include "base/sha1.h"
 #include "base/values.h"
 #include "components/metrics/persisted_logs_metrics_impl.h"
 #include "components/prefs/pref_registry_simple.h"
 #include "components/prefs/scoped_user_pref_update.h"
 #include "components/prefs/testing_pref_service.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/zlib/google/compression_utils.h"
 
 namespace metrics {
 
 namespace {
 
 const char kTestPrefName[] = "TestPref";
-const char kTestOutdatedPrefName[] = "OutdatedTestPref";
 const size_t kLogCountLimit = 3;
 const size_t kLogByteLimit = 1000;
 
 // Compresses |log_data| and returns the result.
 std::string Compress(const std::string& log_data) {
   std::string compressed_log_data;
   EXPECT_TRUE(compression::GzipCompress(log_data, &compressed_log_data));
   return compressed_log_data;
 }
 
@@ skipping 25 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(PersistedLogsTest);
 };
 
 class TestPersistedLogs : public PersistedLogs {
  public:
   TestPersistedLogs(PrefService* service, size_t min_log_bytes)
       : PersistedLogs(std::unique_ptr<PersistedLogsMetricsImpl>(
                              new PersistedLogsMetricsImpl()),
                       service,
                       kTestPrefName,
-                      kTestOutdatedPrefName,
                       kLogCountLimit,
                       min_log_bytes,
                       0) {}
 
   // Stages and removes the next log, while testing it's value.
   void ExpectNextLog(const std::string& expected_log) {
     StageLog();
     EXPECT_EQ(staged_log(), Compress(expected_log));
     DiscardStagedLog();
   }
@@ skipping 206 matching lines @@
 
   TestPersistedLogs persisted_logs(&prefs_, kLogByteLimit);
   persisted_logs.StoreLog(kFooText);
   persisted_logs.StageLog();
 
   EXPECT_EQ(Compress(kFooText), persisted_logs.staged_log());
   EXPECT_EQ(foo_hash, persisted_logs.staged_log_hash());
 }
 
 }  // namespace metrics