Move leak_detector_controller to its own directory

chrome/browser/metrics/leak_detector_controller.h

-// Copyright 2016 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_METRICS_LEAK_DETECTOR_CONTROLLER_H_
-#define CHROME_BROWSER_METRICS_LEAK_DETECTOR_CONTROLLER_H_
-
-#include <vector>
-
-#include "base/macros.h"
-#include "base/threading/thread_checker.h"
-#include "components/metrics/leak_detector/leak_detector.h"
-#include "components/metrics/proto/memory_leak_report.pb.h"
-
-namespace metrics {
-
-// This class initializes the LeakDetector on the browser process and registers
-// itself to be notified of leak reports.
-class LeakDetectorController : public LeakDetector::Observer {
- public:
-  LeakDetectorController();
-  ~LeakDetectorController() override;
-
-  // Retrieves all reports in |stored_reports_|, moving them to |*reports|.
-  // |stored_reports_| is empty afterwards.
-  void GetLeakReports(std::vector<MemoryLeakReportProto>* reports);
-
- protected:
-  // LeakDetector::Observer:
-  void OnLeaksFound(const std::vector<MemoryLeakReportProto>& reports) override;
-
- private:
-  // All leak reports received through OnLeakFound() are stored in protobuf
-  // format.
-  std::vector<MemoryLeakReportProto> stored_reports_;
-
-  // Contains all the parameters passed to LeakDetector. Store them in a single
-  // protobuf message instead of in separate member variables.
-  const MemoryLeakReportProto::Params params_;
-
-  // For thread safety.
-  base::ThreadChecker thread_checker_;
-
-  DISALLOW_COPY_AND_ASSIGN(LeakDetectorController);
-};
-
-}  // namespace metrics
-
-#endif  // CHROME_BROWSER_METRICS_LEAK_DETECTOR_CONTROLLER_H_