Switch the TCP reads on Windows to use non-blocking/non-async I/O.

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
===================================================================
--- chrome/common/chrome_switches.cc	(revision 163292)
+++ chrome/common/chrome_switches.cc	(working copy)
@@ -1540,6 +1540,12 @@
 // Windows 8 and higher.  Used when relaunching metro Chrome.
 const char kForceDesktop[]                   = "force-desktop";
 
+// Allows for disabling the overlapped I/O for TCP reads.
+// Possible values are "on" or "off".
+// The default is "on" which matches the existing behavior.
+// "off" switches to use non-blocking reads and WSAEventSelect.
+const char kOverlappedRead[]                 = "overlapped-reads";
+
 // Relaunches metro Chrome on Windows 8 and higher using a given shortcut.
 const char kRelaunchShortcut[]               = "relaunch-shortcut";