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

content/renderer/origin_trials/trial_token.h

Index: content/renderer/origin_trials/trial_token.h
diff --git a/content/renderer/origin_trials/trial_token.h b/content/renderer/origin_trials/trial_token.h
index c133bbba6b935d93dd63b14132629b1d0bd595b4..7ad75df574c1c3606a0721a75e87257abb2e6517 100644
--- a/content/renderer/origin_trials/trial_token.h
+++ b/content/renderer/origin_trials/trial_token.h
@@ -44,7 +44,8 @@ class CONTENT_EXPORT TrialToken {
                      const std::string& featureName) const;
 
   // Returns true if this token has a valid signature, and has not expired.
-  bool IsValid(const base::Time& now) const;
+  bool IsValid(const base::Time& now,
+               const base::StringPiece& public_key) const;
 
   uint8_t version() { return version_; }
   std::string signature() { return signature_; }