Revert of Add a whitelist for QUIC hosts.

chrome/browser/io_thread.h

Index: chrome/browser/io_thread.h
diff --git a/chrome/browser/io_thread.h b/chrome/browser/io_thread.h
index 763273fd8c503372330529e8c228569e80b8c51e..b7ca041b63978eeeddf1ec4473125169e29ce5d3 100644
--- a/chrome/browser/io_thread.h
+++ b/chrome/browser/io_thread.h
@@ -11,7 +11,6 @@
 #include <map>
 #include <set>
 #include <string>
-#include <unordered_set>
 #include <vector>
 
 #include "base/compiler_specific.h"
@@ -240,7 +239,6 @@
     Optional<bool> quic_close_sessions_on_ip_change;
     Optional<int> quic_idle_connection_timeout_seconds;
     Optional<bool> quic_disable_preconnect_if_0rtt;
-    std::unordered_set<std::string> quic_host_whitelist;
     bool enable_user_alternate_protocol_ports;
     // NetErrorTabHelper uses |dns_probe_service| to send DNS probes when a
     // main frame load fails with a DNS error in order to provide more useful
@@ -463,11 +461,6 @@
   static bool ShouldQuicDisablePreConnectIfZeroRtt(
       const VariationParameters& quic_trial_params);
 
-  // Returns the set of hosts to whitelist for QUIC.
-  static std::unordered_set<std::string> GetQuicHostWhitelist(
-      const base::CommandLine& command_line,
-      const VariationParameters& quic_trial_params);
-
   // Returns the maximum length for QUIC packets, based on any flags in
   // |command_line| or the field trial.  Returns 0 if there is an error
   // parsing any of the options, or if the default value should be used.