Reland 54771 (and 54795) To enable TCP Preconnection by default...

chrome/browser/browser_main.cc

Index: chrome/browser/browser_main.cc
===================================================================
--- chrome/browser/browser_main.cc	(revision 55070)
+++ chrome/browser/browser_main.cc	(working copy)
@@ -1199,10 +1199,15 @@
   // pre-resolution, as well as TCP/IP connection pre-warming.
   // This also registers an observer to discard data when closing incognito
   // mode.
+  bool preconnect_enabled = true;  // Default status (easy to change!).
+  if (parsed_command_line.HasSwitch(switches::kDisablePreconnect))
+    preconnect_enabled = false;
+  else if (parsed_command_line.HasSwitch(switches::kEnablePreconnect))
+    preconnect_enabled = true;
   chrome_browser_net::PredictorInit dns_prefetch(
       user_prefs,
       local_state,
-      parsed_command_line.HasSwitch(switches::kEnablePreconnect),
+      preconnect_enabled,
       parsed_command_line.HasSwitch(switches::kPreconnectDespiteProxy));
 
 #if defined(OS_WIN)