Use OnceCallback on Mojo interfaces in //components/leak_detector

chrome/browser/metrics/leak_detector/leak_detector_remote_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_LEAK_DETECTOR_REMOTE_CONTROLLER_H_
 #define CHROME_BROWSER_METRICS_LEAK_DETECTOR_LEAK_DETECTOR_REMOTE_CONTROLLER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 30 matching lines @@
     // (i.e. been given params with sampling_rate = 0).
     virtual void OnRemoteProcessShutdown() = 0;
   };
 
   ~LeakDetectorRemoteController() override;
 
   static void Create(const service_manager::BindSourceInfo& source_info,
                      mojom::LeakDetectorRequest request);
 
   // mojom::LeakDetector:
-  void GetParams(
-      const mojom::LeakDetector::GetParamsCallback& callback) override;
+  void GetParams(mojom::LeakDetector::GetParamsCallback callback) override;
   void SendLeakReports(std::vector<mojom::MemoryLeakReportPtr>) override;
 
   // Sets a global pointer to a LocalController implementation. The global
   // pointer is defined in the .cc file.
   static void SetLocalControllerInstance(LocalController* controller);
 
  private:
   LeakDetectorRemoteController();
 
   // Gets called when the remote process terminates and the Mojo connection gets
   // closed as a result.
   void OnRemoteProcessShutdown();
 
   // Indicates whether remote process received MemoryLeakReportProto::Params
   // with a non-zero sampling rate, i.e. enabled leak detector.
   bool leak_detector_enabled_on_remote_process_;
 
   DISALLOW_COPY_AND_ASSIGN(LeakDetectorRemoteController);
 };
 
 }  // namespace metrics
 
 #endif  // CHROME_BROWSER_METRICS_LEAK_DETECTOR_LEAK_DETECTOR_REMOTE_CONTROLLER_H_