Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/core/dom/Comment.h

Index: third_party/WebKit/Source/core/dom/Comment.h
diff --git a/third_party/WebKit/Source/core/dom/Comment.h b/third_party/WebKit/Source/core/dom/Comment.h
index 45a0444000dec49d37bd0f2042481a4d62c6be2e..3b16a0024eb3536fd680ec2072face8843c96a05 100644
--- a/third_party/WebKit/Source/core/dom/Comment.h
+++ b/third_party/WebKit/Source/core/dom/Comment.h
@@ -30,14 +30,14 @@ namespace blink {
 class Comment final : public CharacterData {
     DEFINE_WRAPPERTYPEINFO();
 public:
-    static PassRefPtrWillBeRawPtr<Comment> create(Document&, const String&);
+    static RawPtr<Comment> create(Document&, const String&);
 
 private:
     Comment(Document&, const String&);
 
     String nodeName() const override;
     NodeType nodeType() const override;
-    PassRefPtrWillBeRawPtr<Node> cloneNode(bool deep) override;
+    RawPtr<Node> cloneNode(bool deep) override;
 };
 
 DEFINE_NODE_TYPE_CASTS(Comment, nodeType() == Node::COMMENT_NODE);