Use a new Supplement constructor for supplements in core/

third_party/WebKit/Source/core/origin_trials/OriginTrialContext.h

Index: third_party/WebKit/Source/core/origin_trials/OriginTrialContext.h
diff --git a/third_party/WebKit/Source/core/origin_trials/OriginTrialContext.h b/third_party/WebKit/Source/core/origin_trials/OriginTrialContext.h
index 51f5bf3ead1ee0bbdf0c14be0545592cfcd1e15f..cef1f0b3820ccc8cf036a089df88222034e40122 100644
--- a/third_party/WebKit/Source/core/origin_trials/OriginTrialContext.h
+++ b/third_party/WebKit/Source/core/origin_trials/OriginTrialContext.h
@@ -40,7 +40,7 @@ class CORE_EXPORT OriginTrialContext final
  public:
   enum CreateMode { CreateIfNotExists, DontCreateIfNotExists };
 
-  OriginTrialContext(ExecutionContext*, WebTrialTokenValidator*);
+  OriginTrialContext(ExecutionContext&, WebTrialTokenValidator*);
 
   static const char* supplementName();
 
@@ -84,7 +84,6 @@ class CORE_EXPORT OriginTrialContext final
  private:
   void validateToken(const String& token);
 
-  Member<ExecutionContext> m_host;
   Vector<String> m_tokens;
   HashSet<String> m_enabledTrials;
   WebTrialTokenValidator* m_trialTokenValidator;