Move color chooser objects to the Oilpan heap.

Source/core/html/forms/ColorChooserClient.h

Index: Source/core/html/forms/ColorChooserClient.h
diff --git a/Source/core/html/forms/ColorChooserClient.h b/Source/core/html/forms/ColorChooserClient.h
index 2c4c1cb1e5fe7e13ab264fae75616e5ab18037c3..71cc885db369e5608e0e8892567331741eea6358 100644
--- a/Source/core/html/forms/ColorChooserClient.h
+++ b/Source/core/html/forms/ColorChooserClient.h
@@ -33,17 +33,17 @@
 
 #include "platform/ColorSuggestion.h"
 #include "platform/geometry/IntRect.h"
-#include "wtf/OwnPtr.h"
-#include "wtf/PassOwnPtr.h"
+#include "platform/heap/Handle.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 class Element;
 
-class ColorChooserClient {
+class ColorChooserClient : public WillBeGarbageCollectedMixin {
 public:
     virtual ~ColorChooserClient();
+    virtual void trace(Visitor*) { }
 
     virtual void didChooseColor(const Color&) = 0;
     virtual void didEndChooser() = 0;