Respect QuicAllowed policy for new streams

chrome/browser/net/net_pref_observer.h

Index: chrome/browser/net/net_pref_observer.h
diff --git a/chrome/browser/net/net_pref_observer.h b/chrome/browser/net/net_pref_observer.h
new file mode 100644
index 0000000000000000000000000000000000000000..13cf2be5cd6d3347da63a289b6e6e87dbcf2f080
--- /dev/null
+++ b/chrome/browser/net/net_pref_observer.h
@@ -0,0 +1,36 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_NET_NET_PREF_OBSERVER_H_
+#define CHROME_BROWSER_NET_NET_PREF_OBSERVER_H_
+
+#include "base/macros.h"
+#include "components/prefs/pref_member.h"
+
+class PrefService;
+
+namespace user_prefs {
+class PrefRegistrySyncable;
+}
+
+// Monitors network-related preferences for changes and applies them.
+// The supplied PrefService must outlive this NetPrefObserver.
+// Must be used only on the UI thread.
+class NetPrefObserver {
+ public:
+  // |prefs| must be non-NULL and |*prefs| must outlive this.
+  explicit NetPrefObserver(PrefService* prefs);
+  virtual ~NetPrefObserver();
+
+  static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
+
+ private:
+  void ApplySettings();
+
+  BooleanPrefMember quic_allowed_;
+
+  DISALLOW_COPY_AND_ASSIGN(NetPrefObserver);
+};
+
+#endif  // CHROME_BROWSER_NET_NET_PREF_OBSERVER_H_