Refactor OriginTrialPolicy to be an abstract interface in content/public/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 819c255801f06fcf1608ed4e8048698c9c928613..fdf0549f7d06004d135ef507d82e320ed234f3da 100644
--- a/chrome/common/chrome_content_client.h
+++ b/chrome/common/chrome_content_client.h
@@ -11,7 +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 "chrome/common/origin_trials/chrome_origin_trial_policy.h"
 #include "content/public/common/content_client.h"
 
 #if defined(ENABLE_PLUGINS)
@@ -90,18 +90,16 @@ class ChromeContentClient : public content::ContentClient {
   bool AllowScriptExtensionForServiceWorker(const GURL& script_url) override;
 
   bool IsSupplementarySiteIsolationModeEnabled() override;
-  base::StringPiece GetOriginTrialPublicKey() override;
 
-  OriginTrialKeyManager* origin_trial_key_manager() {
-    return &origin_trial_key_manager_;
-  }
+  void InitializeOriginTrialPolicy() override;
+  const content::OriginTrialPolicy* GetOriginTrialPolicy() const override;
 
 #if defined(OS_ANDROID)
   media::MediaClientAndroid* GetMediaClientAndroid() override;
 #endif  // OS_ANDROID
 
  private:
-  OriginTrialKeyManager origin_trial_key_manager_;
+  ChromeOriginTrialPolicy origin_trial_policy_;
 };
 
 #endif  // CHROME_COMMON_CHROME_CONTENT_CLIENT_H_