Support moving pending requests from one DataUseRecorder to another

components/data_use_measurement/core/data_use.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 COMPONENTS_DATA_USE_MEASUREMENT_CORE_DATA_USE_H_
 #define COMPONENTS_DATA_USE_MEASUREMENT_CORE_DATA_USE_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 22 matching lines @@
     // Chrome services.
     SERVICES,
 
     // Fetch from ServiceWorker.
     SERVICE_WORKER,
   };
 
   explicit DataUse(TrafficType traffic_type);
   ~DataUse() override;
 
-  // Merge data use from another instance.
-  // TODO(rajendrant): Check if the merge can be removed. Otherwise user data
-  // needs to support mergeability.
-  void MergeFrom(const DataUse& other);
-
   // Returns the page URL.
   const GURL& url() const { return url_; }
 
   void set_url(const GURL& url) { url_ = url; }
 
   const std::string& description() const { return description_; }
 
   void set_description(const std::string& description) {
     description_ = description;
   }
@@ skipping 15 matching lines @@
 
   int64_t total_bytes_sent_;
   int64_t total_bytes_received_;
 
   DISALLOW_COPY_AND_ASSIGN(DataUse);
 };
 
 }  // namespace data_use_measurement
 
 #endif  // COMPONENTS_DATA_USE_MEASUREMENT_CORE_DATA_USE_H_