Detach LeakDetectorController from remote controller on shutdown

chrome/browser/metrics/leak_detector/leak_detector_controller.cc

 // 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.
 
 #include "chrome/browser/metrics/leak_detector/leak_detector_controller.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "base/rand_util.h"
@@ skipping 159 matching lines @@
 
     // Leak detector parameters are stored in |params_|.
     detector->Init(params_, content::BrowserThread::GetTaskRunnerForThread(
                                 content::BrowserThread::UI));
   }
 }
 
 LeakDetectorController::~LeakDetectorController() {
   DCHECK(thread_checker_.CalledOnValidThread());
   LeakDetector::GetInstance()->RemoveObserver(this);
+  LeakDetectorRemoteController::SetLocalControllerInstance(nullptr);
 }
 
 void LeakDetectorController::GetLeakReports(
     std::vector<MemoryLeakReportProto>* reports) {
   DCHECK(thread_checker_.CalledOnValidThread());
   reports->swap(stored_reports_);
   stored_reports_.clear();
 }
 
 void LeakDetectorController::OnLeaksFound(
@@ skipping 39 matching lines @@
     // Store the report and insert stored parameters.
     stored_reports_.push_back(report);
     stored_reports_.back().mutable_params()->CopyFrom(params_);
     stored_reports_.back().set_source_process(process_type);
     stored_reports_.back().mutable_build_id()->assign(build_id_.begin(),
                                                       build_id_.end());
   }
 }
 
 }  // namespace metrics