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

net/quic/core/quic_protocol.h

Index: net/quic/core/quic_protocol.h
diff --git a/net/quic/core/quic_protocol.h b/net/quic/core/quic_protocol.h
index adb9d8f840b1d4e3b8b3cc1b30daf4f032eb523c..cf659ca286b238c8ae3638fb7e499ed2b4d1025b 100644
--- a/net/quic/core/quic_protocol.h
+++ b/net/quic/core/quic_protocol.h
@@ -608,36 +608,6 @@ class NET_EXPORT_PRIVATE QuicAckListenerInterface
   virtual ~QuicAckListenerInterface() {}
 };
 
-// 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_;
-};
-
 struct NET_EXPORT_PRIVATE AckListenerWrapper {
   AckListenerWrapper(QuicAckListenerInterface* listener,
                      QuicPacketLength data_length);