Move color chooser objects to the Oilpan heap.

Source/core/html/forms/ColorChooser.h

Index: Source/core/html/forms/ColorChooser.h
diff --git a/Source/core/html/forms/ColorChooser.h b/Source/core/html/forms/ColorChooser.h
index ad39c1c0ff5b8dacaa463363dd3a0d3125676abe..f5e2abef1019e59e9f515989cd25ae0a25edccfe 100644
--- a/Source/core/html/forms/ColorChooser.h
+++ b/Source/core/html/forms/ColorChooser.h
@@ -30,15 +30,18 @@
 #ifndef ColorChooser_h
 #define ColorChooser_h
 
+#include "platform/heap/Handle.h"
+
 namespace blink {
 
 class AXObject;
 class Color;
 
-class ColorChooser {
+class ColorChooser : public WillBeGarbageCollectedMixin {
 public:
     ColorChooser();
     virtual ~ColorChooser();
+    virtual void trace(Visitor*) { }
 
     virtual void setSelectedColor(const Color&) { }
     virtual void endChooser() { }