Use net::TestNetworkQualityEstimator in resource loader unittests

net/nqe/network_quality_estimator_test_util.h

Index: net/nqe/network_quality_estimator_test_util.h
diff --git a/net/nqe/network_quality_estimator_test_util.h b/net/nqe/network_quality_estimator_test_util.h
index 6bb0f9626755cc2b029268b4c62868462a0238f8..6faa363b328c915cdf4c9e4b67dcd1283d6f1e8e 100644
--- a/net/nqe/network_quality_estimator_test_util.h
+++ b/net/nqe/network_quality_estimator_test_util.h
@@ -28,6 +28,11 @@ class ExternalEstimateProvider;
 // Helps in setting the current network type and id.
 class TestNetworkQualityEstimator : public NetworkQualityEstimator {
  public:
+  TestNetworkQualityEstimator();
+
+  explicit TestNetworkQualityEstimator(
+      const std::map<std::string, std::string>& variation_params);
+
   TestNetworkQualityEstimator(
       const std::map<std::string, std::string>& variation_params,
       std::unique_ptr<net::ExternalEstimateProvider>
@@ -40,9 +45,6 @@ class TestNetworkQualityEstimator : public NetworkQualityEstimator {
       bool allow_smaller_responses_for_tests,
       bool add_default_platform_observations);
 
-  explicit TestNetworkQualityEstimator(
-      const std::map<std::string, std::string>& variation_params);
-
   ~TestNetworkQualityEstimator() override;
 
   // Runs one URL request to completion.