Oilpan: have DocumentInit use transition types throughout.

Source/core/dom/DocumentInit.h

Index: Source/core/dom/DocumentInit.h
diff --git a/Source/core/dom/DocumentInit.h b/Source/core/dom/DocumentInit.h
index ffe4e9293cacc1d16874a681048dbddc7b441bdf..3458f02678ee6ba92ed2c26341e383c5e82261ae 100644
--- a/Source/core/dom/DocumentInit.h
+++ b/Source/core/dom/DocumentInit.h
@@ -47,7 +47,7 @@ class Settings;
 class DocumentInit FINAL {
     STACK_ALLOCATED();
 public:
-    explicit DocumentInit(const KURL& = KURL(), LocalFrame* = 0, WeakPtr<Document> = WeakPtr<Document>(), HTMLImportsController* = 0);
+    explicit DocumentInit(const KURL& = KURL(), LocalFrame* = 0, WeakPtrWillBeRawPtr<Document> = nullptr, HTMLImportsController* = 0);

[tkent, 2014/06/02 07:56:07]

WeakPtr(std::nullptr_t) is necessary because RawPtr needs nullptr initialization
here, right?

[sof, 2014/06/02 08:01:34]

Yes, exactly so. As RawPtr() (for the Oilpan case) represent an uninitialized
pointer, and we do want it that way, reconciled this invocation of a transition
type constructor by extending WeakPtr's range of constructors.

     DocumentInit(const DocumentInit&);
     ~DocumentInit();
 
@@ -70,18 +70,18 @@ public:
     DocumentInit& withRegistrationContext(CustomElementRegistrationContext*);
     DocumentInit& withNewRegistrationContext();
     PassRefPtrWillBeRawPtr<CustomElementRegistrationContext> registrationContext(Document*) const;
-    WeakPtr<Document> contextDocument() const;
+    WeakPtrWillBeRawPtr<Document> contextDocument() const;
 
-    static DocumentInit fromContext(WeakPtr<Document> contextDocument, const KURL& = KURL());
+    static DocumentInit fromContext(WeakPtrWillBeRawPtr<Document> contextDocument, const KURL& = KURL());
 
 private:
     LocalFrame* frameForSecurityContext() const;
 
     KURL m_url;
     LocalFrame* m_frame;
-    RefPtr<Document> m_parent;
-    RefPtr<Document> m_owner;
-    WeakPtr<Document> m_contextDocument;
+    RefPtrWillBeMember<Document> m_parent;
+    RefPtrWillBeMember<Document> m_owner;
+    WeakPtrWillBeMember<Document> m_contextDocument;
     RawPtrWillBeMember<HTMLImportsController> m_importsController;
     RefPtrWillBeMember<CustomElementRegistrationContext> m_registrationContext;
     bool m_createNewRegistrationContext;