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

Source/core/paint/ThemePainter.h

Index: Source/core/paint/ThemePainter.h
diff --git a/Source/core/paint/ThemePainter.h b/Source/core/paint/ThemePainter.h
index 4137030da9886afce9b8a93cad50e87a2975b596..3be991e7c44148d5a851770e5dde13e629b3dca1 100644
--- a/Source/core/paint/ThemePainter.h
+++ b/Source/core/paint/ThemePainter.h
@@ -24,6 +24,7 @@
 #define ThemePainter_h
 
 #include "platform/ThemeTypes.h"
+#include "wtf/Allocator.h"
 
 namespace blink {
 
@@ -33,6 +34,7 @@ class LayoutObject;
 struct PaintInfo;
 
 class ThemePainter {
+    DISALLOW_ALLOCATION();
 public:
     // This method is called to paint the widget as a background of the LayoutObject.  A widget's foreground, e.g., the
     // text of a button, is always rendered by the engine itself.  The boolean return value indicates