Move trial token code to content/common.

chrome/renderer/origin_trials/origin_trial_key_manager.h

Index: chrome/renderer/origin_trials/origin_trial_key_manager.h
diff --git a/chrome/renderer/origin_trials/origin_trial_key_manager.h b/chrome/renderer/origin_trials/origin_trial_key_manager.h
deleted file mode 100644
index 18b01d841a82a93fcbd1e94f17b89d25b96b550d..0000000000000000000000000000000000000000
--- a/chrome/renderer/origin_trials/origin_trial_key_manager.h
+++ /dev/null
@@ -1,15 +0,0 @@
-// 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_RENDERER_ORIGIN_TRIALS_ORIGIN_TRIAL_KEY_MANAGER_H_
-#define CHROME_RENDERER_ORIGIN_TRIALS_ORIGIN_TRIAL_KEY_MANAGER_H_
-
-#include "base/strings/string_piece.h"
-
-class OriginTrialKeyManager {
- public:
-  base::StringPiece GetPublicKey();
-};
-
-#endif  // CHROME_RENDERER_ORIGIN_TRIALS_ORIGIN_TRIAL_KEY_MANAGER_H_