Oilpan: Prepare moving DateTimeChooser to Oilpan

Source/platform/DateTimeChooserClient.h

Index: Source/platform/DateTimeChooserClient.h
diff --git a/Source/platform/DateTimeChooserClient.h b/Source/platform/DateTimeChooserClient.h
index 0cc3d190e35d7a92c68ba2282f0d02ffcde8bf07..5800ca0014c34266d07194f10267367067796841 100644
--- a/Source/platform/DateTimeChooserClient.h
+++ b/Source/platform/DateTimeChooserClient.h
@@ -36,16 +36,17 @@
 
 namespace WebCore {
 
-class PLATFORM_EXPORT DateTimeChooserClient {
+class PLATFORM_EXPORT DateTimeChooserClient : public WillBeGarbageCollectedMixin {
+    DECLARE_EMPTY_VIRTUAL_DESTRUCTOR_WILL_BE_REMOVED(DateTimeChooserClient);

[tkent, 2014/06/05 04:27:56]

This needs corresponding DEFINE_EMPTY_VIRTUAL_DESTRUCTOR_WILL_BE_REMOVED.

[keishi, 2014/06/05 04:54:58]

Done.

 public:
-    virtual ~DateTimeChooserClient();
-
     // Called when user picked a value.
     virtual void didChooseValue(const String&) = 0;
     // Called when user picked a value.
     virtual void didChooseValue(double) = 0;
     // Called when chooser has ended.
     virtual void didEndChooser() = 0;
+
+    virtual void trace(Visitor*) { }
 };
 
 } // namespace WebCore