Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/core/html/MediaDocument.h

Index: third_party/WebKit/Source/core/html/MediaDocument.h
diff --git a/third_party/WebKit/Source/core/html/MediaDocument.h b/third_party/WebKit/Source/core/html/MediaDocument.h
index 4d6700e9e977e7815c9b5c3475db157669ef6131..75ace73777b82a90a8bb87199adad20d90d143b0 100644
--- a/third_party/WebKit/Source/core/html/MediaDocument.h
+++ b/third_party/WebKit/Source/core/html/MediaDocument.h
@@ -32,15 +32,15 @@ namespace blink {
 
 class MediaDocument final : public HTMLDocument {
 public:
-    static PassRefPtrWillBeRawPtr<MediaDocument> create(const DocumentInit& initializer = DocumentInit())
+    static RawPtr<MediaDocument> create(const DocumentInit& initializer = DocumentInit())
     {
-        return adoptRefWillBeNoop(new MediaDocument(initializer));
+        return new MediaDocument(initializer);
     }
 
 private:
     MediaDocument(const DocumentInit&);
 
-    PassRefPtrWillBeRawPtr<DocumentParser> createParser() override;
+    RawPtr<DocumentParser> createParser() override;
 
     void defaultEventHandler(Event*) override;
 };