Move trial token code to content/common.

chrome/common/chrome_content_client.h

Index: chrome/common/chrome_content_client.h
diff --git a/chrome/common/chrome_content_client.h b/chrome/common/chrome_content_client.h
index c5b7d2d257ce26955f0eb74b4fb07d3cb40204b2..227f737d75ebd1b2f19c2f44e0318a5b34e5f842 100644
--- a/chrome/common/chrome_content_client.h
+++ b/chrome/common/chrome_content_client.h
@@ -11,6 +11,7 @@
 #include "base/compiler_specific.h"
 #include "base/files/file_path.h"
 #include "build/build_config.h"
+#include "chrome/common/origin_trials/origin_trial_key_manager.h"
 #include "content/public/common/content_client.h"
 
 #if defined(ENABLE_PLUGINS)
@@ -86,6 +87,10 @@ class ChromeContentClient : public content::ContentClient {
   void AddServiceWorkerSchemes(std::set<std::string>* schemes) override;
 
   bool IsSupplementarySiteIsolationModeEnabled() override;
+  base::StringPiece GetOriginTrialPublicKey() override;
+
+ private:
+  OriginTrialKeyManager origin_trial_key_manager_;
 };
 
 #endif  // CHROME_COMMON_CHROME_CONTENT_CLIENT_H_