Use TimeDelta::operator/() more, net/ edition.

Bug: 1104532
Change-Id: I0578584a42e7557b0baa23519cebcbe96a3729ef
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2353346
Auto-Submit: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Zhongyi Shi <zhongyi@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798980}

net/nqe/throughput_analyzer.cc

@@ -278,10 +278,9 @@ bool ThroughputAnalyzer::IsHangingWindow(int64_t bits_received,
   // Scale the |duration| to one HTTP RTT, and compute the number of bits that
   // would be received over a duration of one HTTP RTT.
   size_t bits_received_over_one_http_rtt =
-      bits_received * (network_quality_estimator_->GetHttpRTT()
-                           .value_or(base::TimeDelta::FromSeconds(10))
-                           .InMillisecondsF() /
-                       duration.InMillisecondsF());
+      bits_received * (network_quality_estimator_->GetHttpRTT().value_or(
+                           base::TimeDelta::FromSeconds(10)) /
+                       duration);
 
   // If |is_hanging| is true, it implies that less than
   // kCwndSizeKilobytes were received over a period of 1 HTTP RTT. For a network

net/url_request/url_request_throttler_simulation_unittest.cc

@@ -660,10 +660,10 @@ TEST(URLRequestThrottlerSimulation, PerceivedDowntimeRatio) {
     Stats stats;
 
     void PrintTrialDescription() {
-      double duration_minutes =
-          static_cast<double>(duration.InSeconds()) / 60.0;
-      double interval_minutes =
-          static_cast<double>(average_client_interval.InSeconds()) / 60.0;
+      const double duration_minutes =
+          duration / base::TimeDelta::FromMinutes(1);
+      const double interval_minutes =
+          average_client_interval / base::TimeDelta::FromMinutes(1);
       VerboseOut("Trial with %.2f min downtime, avg. interval %.2f min.\n",
                  duration_minutes, interval_minutes);
     }