Refactor OriginTrialPolicy to be an abstract interface in content/public/common

content/public/common/origin_trial_policy.h

+// 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 CONTENT_PUBLIC_COMMON_ORIGIN_TRIAL_POLICY_H_
+#define CONTENT_PUBLIC_COMMON_ORIGIN_TRIAL_POLICY_H_
+
+#include "base/strings/string_piece.h"
+#include "content/common/content_export.h"
+
+namespace content {
+
+class CONTENT_EXPORT OriginTrialPolicy {
+ public:
+  virtual ~OriginTrialPolicy() = default;
+
+  virtual void Initialize() {}
+  virtual base::StringPiece GetPublicKey() const = 0;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_COMMON_ORIGIN_TRIAL_POLICY_H_