Move color chooser objects to the Oilpan heap.

Source/core/html/forms/ColorInputType.h

Index: Source/core/html/forms/ColorInputType.h
diff --git a/Source/core/html/forms/ColorInputType.h b/Source/core/html/forms/ColorInputType.h
index 13adc815a88142b3a3c9ec1f4bd8d4a3745d660d..f5c80a070f90f8fcc9b16bb86aa6b12267357068 100644
--- a/Source/core/html/forms/ColorInputType.h
+++ b/Source/core/html/forms/ColorInputType.h
@@ -39,9 +39,11 @@ namespace blink {
 class ColorChooser;
 
 class ColorInputType FINAL : public BaseClickableWithKeyInputType, public ColorChooserClient {
+    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(ColorInputType);
 public:
     static PassRefPtrWillBeRawPtr<InputType> create(HTMLInputElement&);
     virtual ~ColorInputType();
+    virtual void trace(Visitor*) override;
 
     // ColorChooserClient implementation.
     virtual void didChooseColor(const Color&) OVERRIDE;
@@ -73,7 +75,7 @@ private:
     void endColorChooser();
     HTMLElement* shadowColorSwatch() const;
 
-    OwnPtr<ColorChooser> m_chooser;
+    OwnPtrWillBeMember<ColorChooser> m_chooser;
 };
 
 } // namespace blink