Merge 100408

Source/WebCore/platform/gtk/RenderThemeGtk.cpp

Index: Source/WebCore/platform/gtk/RenderThemeGtk.cpp
===================================================================
--- Source/WebCore/platform/gtk/RenderThemeGtk.cpp	(revision 101562)
+++ Source/WebCore/platform/gtk/RenderThemeGtk.cpp	(working copy)
@@ -525,9 +525,10 @@
     Node* node = renderObject->node();
     if (!node)
         return false;
+    if (!node->isMediaControlElement())
+        return false;
 
-    MediaControlPlayButtonElement* button = static_cast<MediaControlPlayButtonElement*>(node);
-    return paintMediaButton(renderObject, paintInfo.context, rect, button->displayType() == MediaPlayButton ? GTK_STOCK_MEDIA_PLAY : GTK_STOCK_MEDIA_PAUSE);
+    return paintMediaButton(renderObject, paintInfo.context, rect, mediaControlElementType(node) == MediaPlayButton ? GTK_STOCK_MEDIA_PLAY : GTK_STOCK_MEDIA_PAUSE);
 }
 
 bool RenderThemeGtk::paintMediaSeekBackButton(RenderObject* renderObject, const PaintInfo& paintInfo, const IntRect& rect)