Rearrange MediaControls members to match DOM structure

Source/core/html/shadow/MediaControls.cpp

Index: Source/core/html/shadow/MediaControls.cpp
diff --git a/Source/core/html/shadow/MediaControls.cpp b/Source/core/html/shadow/MediaControls.cpp
index f17ced817083d90277be419ea059724b38984767..43d22a4cf8f2bc617013e90ffb0185038d8b74aa 100644
--- a/Source/core/html/shadow/MediaControls.cpp
+++ b/Source/core/html/shadow/MediaControls.cpp
@@ -50,20 +50,20 @@ static bool fullscreenIsSupported(const Document& document)
 MediaControls::MediaControls(HTMLMediaElement& mediaElement)
     : HTMLDivElement(mediaElement.document())
     , m_mediaElement(&mediaElement)
-    , m_panel(nullptr)
-    , m_overlayPlayButton(nullptr)
     , m_overlayEnclosure(nullptr)
+    , m_overlayPlayButton(nullptr)
+    , m_overlayCastButton(nullptr)
+    , m_enclosure(nullptr)
+    , m_panel(nullptr)
     , m_playButton(nullptr)
-    , m_currentTimeDisplay(nullptr)
     , m_timeline(nullptr)
+    , m_currentTimeDisplay(nullptr)
+    , m_durationDisplay(nullptr)
     , m_muteButton(nullptr)
     , m_volumeSlider(nullptr)
     , m_toggleClosedCaptionsButton(nullptr)
-    , m_fullScreenButton(nullptr)
     , m_castButton(nullptr)
-    , m_overlayCastButton(nullptr)
-    , m_durationDisplay(nullptr)
-    , m_enclosure(nullptr)
+    , m_fullScreenButton(nullptr)
     , m_hideMediaControlsTimer(this, &MediaControls::hideMediaControlsTimerFired)
     , m_hideTimerBehaviorFlags(IgnoreNone)
     , m_isMouseOverControls(false)