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

net/quic/core/quic_version_manager.cc

Index: net/quic/core/quic_version_manager.cc
diff --git a/net/quic/core/quic_version_manager.cc b/net/quic/core/quic_version_manager.cc
new file mode 100644
index 0000000000000000000000000000000000000000..6bbfe8015e684ecd14f6e2b4ed82fdcc79e30e1f
--- /dev/null
+++ b/net/quic/core/quic_version_manager.cc
@@ -0,0 +1,37 @@
+// 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.
+
+#include "net/quic/core/quic_version_manager.h"
+
+#include "net/quic/core/quic_flags.h"
+#include "net/quic/core/quic_versions.h"
+
+namespace net {
+
+QuicVersionManager::QuicVersionManager(QuicVersionVector supported_versions)
+    : enable_version_36_(FLAGS_quic_enable_version_36_v3),
+      allowed_supported_versions_(supported_versions),
+      filtered_supported_versions_(
+          FilterSupportedVersions(supported_versions)) {}
+
+QuicVersionManager::~QuicVersionManager() {}
+
+const QuicVersionVector& QuicVersionManager::GetSupportedVersions() {
+  MaybeRefilterSupportedVersions();
+  return filtered_supported_versions_;
+}
+
+void QuicVersionManager::MaybeRefilterSupportedVersions() {
+  if (enable_version_36_ != FLAGS_quic_enable_version_36_v3) {
+    enable_version_36_ = FLAGS_quic_enable_version_36_v3;
+    RefilterSupportedVersions();
+  }
+}
+
+void QuicVersionManager::RefilterSupportedVersions() {
+  filtered_supported_versions_ =
+      FilterSupportedVersions(allowed_supported_versions_);
+}
+
+}  // namespace net