Oilpan: move DateTimeChooser to the heap.

third_party/WebKit/Source/web/DateTimeChooserImpl.h

Index: third_party/WebKit/Source/web/DateTimeChooserImpl.h
diff --git a/third_party/WebKit/Source/web/DateTimeChooserImpl.h b/third_party/WebKit/Source/web/DateTimeChooserImpl.h
index 07cce095ea7ff011dd22c765de2fba4218edee93..ab0db163f2dc96a3ecc9f436e3b47a4327b5ef0a 100644
--- a/third_party/WebKit/Source/web/DateTimeChooserImpl.h
+++ b/third_party/WebKit/Source/web/DateTimeChooserImpl.h
@@ -43,13 +43,15 @@ class PagePopup;
 
 class DateTimeChooserImpl final : public DateTimeChooser, public PagePopupClient {
 public:
-    static PassRefPtr<DateTimeChooserImpl> create(ChromeClientImpl*, DateTimeChooserClient*, const DateTimeChooserParameters&);
+    static PassRefPtrWillBeRawPtr<DateTimeChooserImpl> create(ChromeClientImpl*, DateTimeChooserClient*, const DateTimeChooserParameters&);
     ~DateTimeChooserImpl() override;
 
     // DateTimeChooser functions:
     void endChooser() override;
     AXObject* rootAXObject() override;
 
+    DECLARE_VIRTUAL_TRACE();
+
 private:
     DateTimeChooserImpl(ChromeClientImpl*, DateTimeChooserClient*, const DateTimeChooserParameters&);
     // PagePopupClient functions:
@@ -63,7 +65,7 @@ private:
     Element& ownerElement() override;
     void didClosePopup() override;
 
-    ChromeClientImpl* m_chromeClient;
+    RawPtrWillBeMember<ChromeClientImpl> m_chromeClient;
     DateTimeChooserClient* m_client;
     PagePopup* m_popup;
     DateTimeChooserParameters m_parameters;