Remove the unmaintained performance monitor.

chrome/browser/ui/webui/performance_monitor/performance_monitor_ui.h

Index: chrome/browser/ui/webui/performance_monitor/performance_monitor_ui.h
diff --git a/chrome/browser/ui/webui/performance_monitor/performance_monitor_ui.h b/chrome/browser/ui/webui/performance_monitor/performance_monitor_ui.h
deleted file mode 100644
index 78490c82adb85d7db44e03a614c1204e25a2250d..0000000000000000000000000000000000000000
--- a/chrome/browser/ui/webui/performance_monitor/performance_monitor_ui.h
+++ /dev/null
@@ -1,22 +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_UI_WEBUI_PERFORMANCE_MONITOR_PERFORMANCE_MONITOR_UI_H_
-#define CHROME_BROWSER_UI_WEBUI_PERFORMANCE_MONITOR_PERFORMANCE_MONITOR_UI_H_
-
-#include "content/public/browser/web_ui_controller.h"
-
-namespace performance_monitor {
-
-class PerformanceMonitorUI : public content::WebUIController {
- public:
-  explicit PerformanceMonitorUI(content::WebUI* web_ui);
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(PerformanceMonitorUI);
-};
-
-}  // namespace performance_monitor
-
-#endif  // CHROME_BROWSER_UI_WEBUI_PERFORMANCE_MONITOR_PERFORMANCE_MONITOR_UI_H_