Move QuicVersionManager into standalone .h/.cc. No behavior change.

net/quic/core/quic_version_manager.h

Index: net/quic/core/quic_version_manager.h
diff --git a/net/quic/core/quic_version_manager.h b/net/quic/core/quic_version_manager.h
new file mode 100644
index 0000000000000000000000000000000000000000..cd8e9f95373f05ccfc27f3ec0b78a6c1793ed875
--- /dev/null
+++ b/net/quic/core/quic_version_manager.h
@@ -0,0 +1,44 @@
+// Copyright (c) 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 NET_QUIC_CORE_QUIC_VERSION_MANAGER_H_
+#define NET_QUIC_CORE_QUIC_VERSION_MANAGER_H_
+
+#include "net/quic/core/quic_versions.h"
+
+namespace net {
+
+// Used to generate filtered supported versions based on flags.
+class NET_EXPORT_PRIVATE QuicVersionManager {
+ public:
+  explicit QuicVersionManager(QuicVersionVector supported_versions);
+  virtual ~QuicVersionManager();
+
+  // Returns currently supported QUIC versions.
+  const QuicVersionVector& GetSupportedVersions();
+
+ protected:
+  // Maybe refilter filtered_supported_versions_ based on flags.
+  void MaybeRefilterSupportedVersions();
+
+  // Refilters filtered_supported_versions_.
+  virtual void RefilterSupportedVersions();
+
+  const QuicVersionVector& filtered_supported_versions() const {
+    return filtered_supported_versions_;
+  }
+
+ private:
+  // FLAGS_quic_enable_version_36_v3
+  bool enable_version_36_;
+  // The list of versions that may be supported.
+  QuicVersionVector allowed_supported_versions_;
+  // This vector contains QUIC versions which are currently supported based on
+  // flags.
+  QuicVersionVector filtered_supported_versions_;
+};
+
+}  // namespace net
+
+#endif  // NET_QUIC_CORE_QUIC_VERSION_MANAGER_H_