Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/core/css/StyleMedia.h

Index: third_party/WebKit/Source/core/css/StyleMedia.h
diff --git a/third_party/WebKit/Source/core/css/StyleMedia.h b/third_party/WebKit/Source/core/css/StyleMedia.h
index d158c64c5c8bff936f62c4283d750841cb18ba7c..7c16c645565b89b25c114192e21e586b61d5db2b 100644
--- a/third_party/WebKit/Source/core/css/StyleMedia.h
+++ b/third_party/WebKit/Source/core/css/StyleMedia.h
@@ -37,11 +37,11 @@ namespace blink {
 
 class LocalFrame;
 
-class StyleMedia final : public RefCountedWillBeGarbageCollected<StyleMedia>, public DOMWindowProperty, public ScriptWrappable {
+class StyleMedia final : public GarbageCollected<StyleMedia>, public DOMWindowProperty, public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();
-    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(StyleMedia);
+    USING_GARBAGE_COLLECTED_MIXIN(StyleMedia);
 public:
-    static PassRefPtrWillBeRawPtr<StyleMedia> create(LocalFrame* frame) { return adoptRefWillBeNoop(new StyleMedia(frame));}
+    static RawPtr<StyleMedia> create(LocalFrame* frame) { return new StyleMedia(frame);}
 
     AtomicString type() const;
     bool matchMedium(const String&) const;