metrics: Connect leak detector to allocator

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"
@@ skipping 12 matching lines @@
 
   // 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 OnLeakFound(const LeakDetector::LeakReport& report) override;
 
  private:
-  // Leak detector interface object.
-  LeakDetector detector_;
-
   // All leak reports received through OnLeakFound() are stored in protobuf
   // format.
   std::vector<MemoryLeakReportProto> stored_reports_;
 
   // For thread safety.
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(LeakDetectorController);
 };
 
 }  // namespace metrics
 
 #endif  // CHROME_BROWSER_METRICS_LEAK_DETECTOR_CONTROLLER_H_