Remove the unmaintained performance monitor.

chrome/browser/chrome_browser_main.h

 // 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_CHROME_BROWSER_MAIN_H_
 #define CHROME_BROWSER_CHROME_BROWSER_MAIN_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/metrics/field_trial.h"
@@ skipping 27 matching lines @@
 
 #if defined(OS_WIN)
 extern const char kMissingLocaleDataMessage[];
 #endif
 }
 
 namespace chrome_browser_metrics {
 class TrackingSynchronizer;
 }
 
-namespace performance_monitor {
-class StartupTimer;
-}
-
 class ChromeBrowserMainParts : public content::BrowserMainParts {
  public:
   virtual ~ChromeBrowserMainParts();
 
   // Add additional ChromeBrowserMainExtraParts.
   virtual void AddParts(ChromeBrowserMainExtraParts* parts);
 
  protected:
   explicit ChromeBrowserMainParts(
       const content::MainFunctionParams& parameters);
@@ skipping 66 matching lines @@
   int result_code_;
 
   // Create StartupTimeBomb object for watching jank during startup.
   scoped_ptr<StartupTimeBomb> startup_watcher_;
 
   // Create ShutdownWatcherHelper object for watching jank during shutdown.
   // Please keep |shutdown_watcher| as the first object constructed, and hence
   // it is destroyed last.
   scoped_ptr<ShutdownWatcherHelper> shutdown_watcher_;
 
-  // A timer to hold data regarding startup and session restore times for
-  // PerformanceMonitor so that we don't have to start the entire
-  // PerformanceMonitor at browser startup.
-  scoped_ptr<performance_monitor::StartupTimer> startup_timer_;
-
   // Creating this object starts tracking the creation and deletion of Task
   // instance. This MUST be done before main_message_loop, so that it is
   // destroyed after the main_message_loop.
   task_profiler::AutoTracking tracking_objects_;
 
   // Statistical testing infrastructure for the entire browser. NULL until
   // SetupMetricsAndFieldTrials is called.
   scoped_ptr<base::FieldTrialList> field_trial_list_;
 
   ChromeBrowserFieldTrials browser_field_trials_;
@@ skipping 40 matching lines @@
   bool restart_last_session_;
 
   // Tests can set this to true to disable restricting cookie access in the
   // network stack, as this can only be done once.
   static bool disable_enforcing_cookie_policies_for_tests_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeBrowserMainParts);
 };
 
 #endif  // CHROME_BROWSER_CHROME_BROWSER_MAIN_H_