Oilpan: fix build after r200730.

Source/core/dom/DocumentTiming.h

Index: Source/core/dom/DocumentTiming.h
diff --git a/Source/core/dom/DocumentTiming.h b/Source/core/dom/DocumentTiming.h
index 14f72f88c66575e427ec96b8e2cbf1821c12b20e..6cc1a8c59966d4121ae92593dfb82e87beb41693 100644
--- a/Source/core/dom/DocumentTiming.h
+++ b/Source/core/dom/DocumentTiming.h
@@ -32,7 +32,8 @@ namespace blink {
 
 class Document;
 
-class DocumentTiming {
+class DocumentTiming final {
+    DISALLOW_ALLOCATION();
 public:
     DocumentTiming(WeakPtrWillBeRawPtr<Document>);
 
@@ -50,6 +51,8 @@ public:
     double domComplete() const { return m_domComplete; }
     double firstLayout() const { return m_firstLayout; }
 
+    DECLARE_TRACE();
+
 private:
     void notifyDocumentTimingChanged();
 
@@ -60,7 +63,7 @@ private:
     double m_domComplete;
     double m_firstLayout;
 
-    WeakPtrWillBeRawPtr<Document> m_document;
+    WeakPtrWillBeMember<Document> m_document;

[haraken, 2015/08/19 00:00:20]

I wonder why this needs to be a WeakPtr in non-oilpan. It looks a bit strange
that we need weak semantics in non-oilpan but don't need weak semantics in
oilpan.

I guess this can be RawPtrWillBeMember.

[sof, 2015/08/19 05:18:46]

It is/was a good question, see https://codereview.chromium.org/1290683003/

 };
 
 }