[Experimental Framework] Move the trial token public key out of content and into the embedder.

content/renderer/origin_trials/trial_token_validator.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_RENDERER_ORIGIN_TRIALS_TRIAL_TOKEN_VALIDATOR_H_
 #define CONTENT_RENDERER_ORIGIN_TRIALS_TRIAL_TOKEN_VALIDATOR_H_
 
 #include <string>
+#include "content/common/content_export.h"
 #include "third_party/WebKit/public/platform/WebTrialTokenValidator.h"
 
 namespace content {
 
 // The TrialTokenValidator is called by the Experimental Framework code in Blink
 // to validate tokens to enable experimental features.
 //
 // This class is thread-safe.
-class TrialTokenValidator : public blink::WebTrialTokenValidator {
+class CONTENT_EXPORT TrialTokenValidator
+    : public NON_EXPORTED_BASE(blink::WebTrialTokenValidator) {
  public:
   TrialTokenValidator();
   ~TrialTokenValidator() override;
 
   // blink::WebTrialTokenValidator implementation
   bool validateToken(const blink::WebString& token,
                      const blink::WebString& origin,
                      const blink::WebString& featureName) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TrialTokenValidator);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_ORIGIN_TRIALS_TRIAL_TOKEN_VALIDATOR_H_