Remove Apple's unused implementation of private browsing from WebCore

Source/WebCore/platform/graphics/MediaPlayer.cpp

Index: Source/WebCore/platform/graphics/MediaPlayer.cpp
diff --git a/Source/WebCore/platform/graphics/MediaPlayer.cpp b/Source/WebCore/platform/graphics/MediaPlayer.cpp
index 555065e25a07dbb7b7ea72028598e227fe62a78f..31a299b75e02e2cdc6583f2487644ae3c2b72fce 100644
--- a/Source/WebCore/platform/graphics/MediaPlayer.cpp
+++ b/Source/WebCore/platform/graphics/MediaPlayer.cpp
@@ -286,7 +286,6 @@ MediaPlayer::MediaPlayer(MediaPlayerClient* client)
     , m_volume(1.0f)
     , m_muted(false)
     , m_preservesPitch(true)
-    , m_privateBrowsing(false)
     , m_shouldPrepareToRender(false)
     , m_contentMIMETypeWasInferredFromExtension(false)
 {
@@ -361,7 +360,6 @@ void MediaPlayer::loadWithNextMediaEngine(MediaPlayerFactory* current)
         m_private = engine->constructor(this);
         if (m_mediaPlayerClient)
             m_mediaPlayerClient->mediaPlayerEngineUpdated(this);
-        m_private->setPrivateBrowsingMode(m_privateBrowsing);
         m_private->setPreload(m_preload);
         m_private->setPreservesPitch(preservesPitch());
         if (m_shouldPrepareToRender)
@@ -813,12 +811,6 @@ void MediaPlayer::clearMediaCacheForSite(const String& site)
     }
 }
 
-void MediaPlayer::setPrivateBrowsingMode(bool privateBrowsingMode)
-{
-    m_privateBrowsing = privateBrowsingMode;
-    m_private->setPrivateBrowsingMode(m_privateBrowsing);
-}
-
 // Client callbacks.
 void MediaPlayer::networkStateChanged()
 {