Remove HTTP pipelining support.

chrome/browser/metrics/metrics_service.cc

Index: chrome/browser/metrics/metrics_service.cc
diff --git a/chrome/browser/metrics/metrics_service.cc b/chrome/browser/metrics/metrics_service.cc
index 8d40156120dbe823759a3e26846e5a8c8d6d6c51..ecada062b7e0a2fecdef90520b7c8dc4d4fb3fd8 100644
--- a/chrome/browser/metrics/metrics_service.cc
+++ b/chrome/browser/metrics/metrics_service.cc
@@ -191,7 +191,6 @@
 #include "chrome/browser/metrics/omnibox_metrics_provider.h"
 #include "chrome/browser/metrics/time_ticks_experiment_win.h"
 #include "chrome/browser/metrics/tracking_synchronizer.h"
-#include "chrome/browser/net/http_pipelining_compatibility_client.h"
 #include "chrome/browser/net/network_stats.h"
 #include "chrome/browser/ui/browser_otr_state.h"
 #include "chrome/common/chrome_constants.h"
@@ -825,11 +824,9 @@ void MetricsService::CountBrowserCrashDumpAttempts() {
 void MetricsService::InitializeMetricsState() {
 #if defined(OS_POSIX)
   network_stats_server_ = chrome_common_net::kEchoTestServerLocation;
-  http_pipelining_test_server_ = chrome_common_net::kPipelineTestServerBaseUrl;
 #else
   BrowserDistribution* dist = BrowserDistribution::GetDistribution();
   network_stats_server_ = dist->GetNetworkStatsServer();
-  http_pipelining_test_server_ = dist->GetHttpPipeliningTestServer();
 #endif
 
   PrefService* pref = g_browser_process->local_state();
@@ -1643,8 +1640,6 @@ void MetricsService::OnURLFetchComplete(const net::URLFetcher* source) {
   IOThread* io_thread = g_browser_process->io_thread();
   if (server_is_healthy && io_thread) {
     chrome_browser_net::CollectNetworkStats(network_stats_server_, io_thread);
-    chrome_browser_net::CollectPipeliningCapabilityStatsOnUIThread(
-        http_pipelining_test_server_, io_thread);
 #if defined(OS_WIN)
     chrome::CollectTimeTicksStats();
 #endif