Make classes and structures in core/paint fast-allocated.

Source/core/paint/MediaControlsPainter.h

Index: Source/core/paint/MediaControlsPainter.h
diff --git a/Source/core/paint/MediaControlsPainter.h b/Source/core/paint/MediaControlsPainter.h
index aa3781a1aac524ecc82dc2901776d775c8487246..64b7fd36ae061ac4ea7cb265e73de397d7b87a3e 100644
--- a/Source/core/paint/MediaControlsPainter.h
+++ b/Source/core/paint/MediaControlsPainter.h
@@ -28,6 +28,8 @@
 #ifndef MediaControlsPainter_h
 #define MediaControlsPainter_h
 
+#include "wtf/Allocator.h"
+
 namespace blink {
 
 struct PaintInfo;
@@ -37,6 +39,7 @@ class IntRect;
 class LayoutObject;
 
 class MediaControlsPainter {
+    STATIC_ONLY(MediaControlsPainter);
 public:
     static bool paintMediaMuteButton(LayoutObject*, const PaintInfo&, const IntRect&);
     static bool paintMediaPlayButton(LayoutObject*, const PaintInfo&, const IntRect&);