Change initDataType and sessionType to be enums

Source/modules/encryptedmedia/HTMLMediaElementEncryptedMedia.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 HTMLMediaElementEncryptedMedia_h
 #define HTMLMediaElementEncryptedMedia_h
 
 #include "core/EventTypeNames.h"
 #include "core/dom/DOMTypedArray.h"
 #include "core/events/EventTarget.h"
 #include "platform/Supplementable.h"
 #include "platform/heap/Handle.h"
+#include "public/platform/WebEncryptedMediaTypes.h"
 #include "public/platform/WebMediaPlayerClient.h"
 
 namespace blink {
 
 class ExceptionState;
 class HTMLMediaElement;
 class MediaKeys;
 class ScriptPromise;
 class ScriptState;
 
@@ skipping 14 matching lines @@
     DEFINE_STATIC_ATTRIBUTE_EVENT_LISTENER(webkitneedkey);
 
     // encrypted media extensions (WD)
     static MediaKeys* mediaKeys(HTMLMediaElement&);
     static ScriptPromise setMediaKeys(ScriptState*, HTMLMediaElement&, MediaKeys*);
     DEFINE_STATIC_ATTRIBUTE_EVENT_LISTENER(encrypted);
 
     static void keyAdded(HTMLMediaElement&, const String& keySystem, const String& sessionId);
     static void keyError(HTMLMediaElement&, const String& keySystem, const String& sessionId, WebMediaPlayerClient::MediaKeyErrorCode, unsigned short systemCode);
     static void keyMessage(HTMLMediaElement&, const String& keySystem, const String& sessionId, const unsigned char* message, unsigned messageLength, const WebURL& defaultURL);
-    static void encrypted(HTMLMediaElement&, const String& initDataType, const unsigned char* initData, unsigned initDataLength);
+    static void encrypted(HTMLMediaElement&, WebEncryptedMediaInitDataType, const unsigned char* initData, unsigned initDataLength);
     static void didBlockPlaybackWaitingForKey(HTMLMediaElement&);
     static void didResumePlaybackBlockedForKey(HTMLMediaElement&);
     static void playerDestroyed(HTMLMediaElement&);
     static WebContentDecryptionModule* contentDecryptionModule(HTMLMediaElement&);
 
     static HTMLMediaElementEncryptedMedia& from(HTMLMediaElement&);
     static const char* supplementName();
 
     DECLARE_VIRTUAL_TRACE();
 
@@ skipping 24 matching lines @@
     EmeMode m_emeMode;
 
     bool m_isWaitingForKey;
 
     PersistentWillBeMember<MediaKeys> m_mediaKeys;
 };
 
 } // namespace blink
 
 #endif