Change initDataType and sessionType to be enums

public/platform/WebContentDecryptionModuleSession.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 17 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef WebContentDecryptionModuleSession_h
 #define WebContentDecryptionModuleSession_h
 
 #include "WebCommon.h"
 #include "WebVector.h"
 #include "public/platform/WebContentDecryptionModuleException.h"
 #include "public/platform/WebContentDecryptionModuleResult.h"
+#include "public/platform/WebEncryptedMediaTypes.h"
 
 namespace blink {
 
 class WebEncryptedMediaKeyInformation;
 class WebString;
 class WebURL;
 
 class BLINK_PLATFORM_EXPORT WebContentDecryptionModuleSession {
 public:
     class BLINK_PLATFORM_EXPORT Client {
@@ skipping 21 matching lines @@
 
     protected:
         virtual ~Client();
     };
 
     virtual ~WebContentDecryptionModuleSession();
 
     virtual void setClientInterface(Client*) = 0;
     virtual WebString sessionId() const = 0;
 
+    virtual void initializeNewSession(WebEncryptedMediaInitDataType, const unsigned char* initData, size_t initDataLength, WebEncryptedMediaSessionType, WebContentDecryptionModuleResult);
+    // FIXME: remove this version once Chromium updated to pass enums.
     virtual void initializeNewSession(const WebString& initDataType, const unsigned char* initData, size_t initDataLength, const WebString& sessionType, WebContentDecryptionModuleResult) = 0;
     virtual void load(const WebString& sessionId, WebContentDecryptionModuleResult) = 0;
     virtual void update(const unsigned char* response, size_t responseLength, WebContentDecryptionModuleResult) = 0;
     virtual void close(WebContentDecryptionModuleResult) = 0;
     virtual void remove(WebContentDecryptionModuleResult) = 0;
 };
 
 } // namespace blink
 
 #endif // WebContentDecryptionModuleSession_h