Remove the unmaintained performance monitor.

chrome/browser/performance_monitor/key_builder.h

Index: chrome/browser/performance_monitor/key_builder.h
diff --git a/chrome/browser/performance_monitor/key_builder.h b/chrome/browser/performance_monitor/key_builder.h
deleted file mode 100644
index 1b4ac24cce68a18a0da864637083197f2fd8fae6..0000000000000000000000000000000000000000
--- a/chrome/browser/performance_monitor/key_builder.h
+++ /dev/null
@@ -1,98 +0,0 @@
-// Copyright (c) 2012 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 CHROME_BROWSER_PERFORMANCE_MONITOR_KEY_BUILDER_H_
-#define CHROME_BROWSER_PERFORMANCE_MONITOR_KEY_BUILDER_H_
-
-#include <map>
-
-#include "chrome/browser/performance_monitor/event.h"
-#include "chrome/browser/performance_monitor/metric.h"
-
-namespace performance_monitor {
-
-struct RecentKey {
-  RecentKey(const std::string& recent_time,
-            MetricType recent_type,
-            const std::string& recent_activity);
-  ~RecentKey();
-
-  const std::string time;
-  const MetricType type;
-  const std::string activity;
-};
-
-struct MaxValueKey {
-  MaxValueKey(MetricType max_value_type,
-              const std::string& max_value_activity)
-      : type(max_value_type),
-        activity(max_value_activity) {}
-  ~MaxValueKey() {}
-
-  const MetricType type;
-  const std::string activity;
-};
-
-struct MetricKey {
-  MetricKey(const std::string& metric_time,
-            MetricType metric_type,
-            const std::string& metric_activity);
-  ~MetricKey();
-
-  const std::string time;
-  const MetricType type;
-  const std::string activity;
-};
-
-// This class is responsible for building the keys which are used internally by
-// PerformanceMonitor's database. These keys should only be referenced by the
-// database, and should not be used externally.
-class KeyBuilder {
- public:
-  KeyBuilder();
-  ~KeyBuilder();
-
-  // Key Creation: Create the keys for different databases. The schemas are
-  // listed with the methods. A '-' in the schema represents kDelimeter.
-
-  // Key Schema: <Time>
-  std::string CreateActiveIntervalKey(const base::Time& time);
-
-  // Key Schema: <Metric>-<Time>-<Activity>
-  std::string CreateMetricKey(const base::Time& time,
-                              const MetricType type,
-                              const std::string& activity);
-
-  // Key Schema: <Time>-<Event Type>
-  std::string CreateEventKey(const base::Time& time, const EventType type);
-
-  // Key Schema: <Time>-<Metric>-<Activity>
-  std::string CreateRecentKey(const base::Time& time,
-                              const MetricType type,
-                              const std::string& activity);
-
-  // Key Schema: <Activity>-<Metric>
-  std::string CreateRecentMapKey(const MetricType type,
-                                 const std::string& activity);
-
-  std::string CreateMaxValueKey(const MetricType type,
-                                const std::string& activity);
-
-  EventType EventKeyToEventType(const std::string& key);
-  RecentKey SplitRecentKey(const std::string& key);
-  MetricKey SplitMetricKey(const std::string& key);
-
- private:
-  // Populate the maps from [Event, Metric]Type to key characters.
-  void PopulateKeyMaps();
-
-  std::map<EventType, int> event_type_to_event_key_char_;
-  std::map<int, EventType> event_key_char_to_event_type_;
-  std::map<MetricType, int> metric_type_to_metric_key_char_;
-  std::map<int, MetricType> metric_key_char_to_metric_type_;
-};
-
-}  // namespace performance_monitor
-
-#endif  // CHROME_BROWSER_PERFORMANCE_MONITOR_KEY_BUILDER_H_