Completely disable use of bind() with pseudo-random port selection on Windows.

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 ef742bfd49a0febbdb40946d72507f2f1f72057a..ecc6e0f461f271880c92849c2f070cf34c5ef520 100644
--- a/chrome/browser/io_thread.h
+++ b/chrome/browser/io_thread.h
@@ -165,6 +165,7 @@ class IOThread : public content::BrowserThreadDelegate {
     Optional<string> trusted_spdy_proxy;
     Optional<bool> enable_quic;
     Optional<bool> enable_quic_https;
+    Optional<bool> enable_quic_port_selection;
     Optional<size_t> quic_max_packet_length;
     Optional<net::QuicVersionVector> quic_supported_versions;
     Optional<net::HostPortPair> origin_to_force_quic_on;
@@ -274,6 +275,15 @@ class IOThread : public content::BrowserThreadDelegate {
   bool ShouldEnableQuicHttps(const CommandLine& command_line,
                              base::StringPiece quic_trial_group);
 
+  // Returns true if the selection of the ephemeral port in bind() should be
+  // performed by Chromium, and false if the OS should select the port.  The OS
+  // option is used to prevent Windows from posting a security security warning
+  // dialog.
+  // TODO(grt) bug=329255: Detect presence of rule on Windows that allows us to
+  // do port selection without inducing a dialog.
+  bool IOThread::ShouldEnableEnableQuicPortSelection(
+      const CommandLine& command_line);
+
   // 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.