InlinedVisitor: Migrate encryptedmedia to use inlined tracing

Source/modules/encryptedmedia/EncryptedMediaRequest.h

 // Copyright 2014 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 EncryptedMediaRequest_h
 #define EncryptedMediaRequest_h
 
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class SecurityOrigin;
 class WebContentDecryptionModuleAccess;
 struct WebMediaKeySystemConfiguration;
 class WebString;
 template <typename T> class WebVector;
 
 class EncryptedMediaRequest : public GarbageCollectedFinalized<EncryptedMediaRequest> {
 public:
     virtual ~EncryptedMediaRequest() { }
 
     virtual WebString keySystem() const = 0;
     virtual const WebVector<WebMediaKeySystemConfiguration>& supportedConfigurations() const = 0;
 
     virtual SecurityOrigin* securityOrigin() const = 0;
 
     virtual void requestSucceeded(WebContentDecryptionModuleAccess*) = 0;
     virtual void requestNotSupported(const WebString& errorMessage) = 0;
 
-    virtual void trace(Visitor*) { }
+    DEFINE_INLINE_VIRTUAL_TRACE() { }
 };
 
 } // namespace blink
 
 #endif // EncryptedMediaRequest_h