Add disabled origin trial feature list

content/shell/common/shell_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_SHELL_COMMON_SHELL_ORIGIN_TRIAL_POLICY_H_
 #define CONTENT_SHELL_COMMON_SHELL_ORIGIN_TRIAL_POLICY_H_
 
 #include "base/macros.h"
 #include "base/strings/string_piece.h"
 #include "content/public/common/origin_trial_policy.h"
 
 namespace content {
 
 class ShellOriginTrialPolicy : public OriginTrialPolicy {
  public:
   ShellOriginTrialPolicy();
   ~ShellOriginTrialPolicy() override;
 
   // OriginTrialPolicy interface
   base::StringPiece GetPublicKey() const override;
+  bool IsFeatureDisabled(base::StringPiece feature) const override;
 
  private:
   base::StringPiece public_key_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellOriginTrialPolicy);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_SHELL_COMMON_SHELL_ORIGIN_TRIAL_POLICY_H_