Create a DataUseRecorder instance for each page load in Chrome.

components/data_use_measurement/core/data_use_network_delegate_unittest.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 "components/data_use_measurement/core/data_use_network_delegate.h"
 
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/test/histogram_tester.h"
 #include "components/data_use_measurement/core/data_use_ascriber.h"
@@ skipping 20 matching lines @@
 
   static void MarkAsUserRequest(net::URLRequest* request) {
     request->SetUserData(kUserDataKey, new UserRequestUserDataForTesting());
   }
 };
 
 class TestDataUseAscriber : public DataUseAscriber {
  public:
   TestDataUseAscriber() {}
 
-  DataUseRecorder* GetDataUseRecorder(net::URLRequest* request) override {
+  DataUseRecorder* GetDataUseRecorder(net::URLRequest* request,
+                                      bool can_create_new) override {
     return nullptr;
   }
 
   std::unique_ptr<URLRequestClassifier> CreateURLRequestClassifier()
       const override {
     return nullptr;
   }
 };
 
 // static
@@ skipping 171 matching lines @@
   histogram_tester.ExpectTotalCount(
       "DataUse.TrafficSize.System.Downstream.Foreground.NotCellular", 0);
   histogram_tester.ExpectTotalCount(
       "DataUse.TrafficSize.System.Upstream.Foreground.NotCellular", 0);
   histogram_tester.ExpectTotalCount("DataUse.MessageSize.Suggestions", 0);
 }
 
 }  // namespace
 
 }  // namespace data_use_measurement