[Presentation API] Change ListenForSessionMessages API to client-style.

content/public/browser/presentation_session_message.h

Index: content/public/browser/presentation_session_message.h
diff --git a/content/public/browser/presentation_session_message.h b/content/public/browser/presentation_session_message.h
index 80e8050ca0556616e7d7912e45bfdddde3bc0485..d3192c04e27147dc71a00dbd55ff3e68a18828d1 100644
--- a/content/public/browser/presentation_session_message.h
+++ b/content/public/browser/presentation_session_message.h
@@ -24,41 +24,13 @@ enum PresentationMessageType {
 // Empty messages are allowed.
 struct CONTENT_EXPORT PresentationSessionMessage {
  public:
+  explicit PresentationSessionMessage(PresentationMessageType type);
   ~PresentationSessionMessage();
 
-  // Creates string message, which takes the ownership of |message|.
-  static scoped_ptr<PresentationSessionMessage> CreateStringMessage(
-      const std::string& presentation_url,
-      const std::string& presentation_id,
-      scoped_ptr<std::string> message);
-
-  // Creates array buffer message, which takes the ownership of |data|.
-  static scoped_ptr<PresentationSessionMessage> CreateArrayBufferMessage(
-      const std::string& presentation_url,
-      const std::string& presentation_id,
-      scoped_ptr<std::vector<uint8_t>> data);
-
-  // Creates blob message, which takes the ownership of |data|.
-  static scoped_ptr<PresentationSessionMessage> CreateBlobMessage(
-      const std::string& presentation_url,
-      const std::string& presentation_id,
-      scoped_ptr<std::vector<uint8_t>> data);
-
   bool is_binary() const;
-  std::string presentation_url;
-  std::string presentation_id;
-  PresentationMessageType type;
-  scoped_ptr<std::string> message;
+  const PresentationMessageType type;
+  std::string message;
   scoped_ptr<std::vector<uint8_t>> data;
-
- private:
-  PresentationSessionMessage(const std::string& presentation_url,
-                             const std::string& presentation_id,
-                             scoped_ptr<std::string> message);
-  PresentationSessionMessage(const std::string& presentation_url,
-                             const std::string& presentation_id,
-                             PresentationMessageType type,
-                             scoped_ptr<std::vector<uint8_t>> data);
 };
 
 }  // namespace content