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

chrome/common/origin_trials/chrome_origin_trial_policy.h

 // 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 CHROME_COMMON_ORIGIN_TRIALS_ORIGIN_TRIAL_KEY_MANAGER_H_
-#define CHROME_COMMON_ORIGIN_TRIALS_ORIGIN_TRIAL_KEY_MANAGER_H_
+#ifndef CHROME_COMMON_ORIGIN_TRIALS_CHROME_ORIGIN_TRIAL_POLICY_H_
+#define CHROME_COMMON_ORIGIN_TRIALS_CHROME_ORIGIN_TRIAL_POLICY_H_
 
 #include <set>
 #include <string>
 
 #include "base/macros.h"
 #include "base/strings/string_piece.h"
+#include "content/public/common/origin_trial_policy.h"
 
 // This class is instantiated on the main/ui thread, but its methods can be
 // accessed from any thread.
-class OriginTrialKeyManager {
+class ChromeOriginTrialPolicy : public content::OriginTrialPolicy {
  public:
-  OriginTrialKeyManager();
-  ~OriginTrialKeyManager();
+  ChromeOriginTrialPolicy();
+  ~ChromeOriginTrialPolicy() override;
+
+  // OriginTrialPolicy interface
+  base::StringPiece GetPublicKey() const override;
+  bool IsFeatureDisabled(base::StringPiece feature) const override;
 
   bool SetPublicKeyFromASCIIString(const std::string& ascii_public_key);
-  base::StringPiece GetPublicKey() const;
   bool SetDisabledFeatures(const std::string& disabled_feature_list);
-  bool IsFeatureDisabled(base::StringPiece feature) const;
 
  private:
   std::string public_key_;
   std::set<std::string> disabled_features_;
 
-  DISALLOW_COPY_AND_ASSIGN(OriginTrialKeyManager);
+  DISALLOW_COPY_AND_ASSIGN(ChromeOriginTrialPolicy);
 };
 
-#endif  // CHROME_COMMON_ORIGIN_TRIALS_ORIGIN_TRIAL_KEY_MANAGER_H_
+#endif  // CHROME_COMMON_ORIGIN_TRIALS_CHROME_ORIGIN_TRIAL_POLICY_H_