Remove CrossThreadCopier for WeakMember and WeakMember*

third_party/WebKit/Source/platform/CrossThreadCopier.h

Index: third_party/WebKit/Source/platform/CrossThreadCopier.h
diff --git a/third_party/WebKit/Source/platform/CrossThreadCopier.h b/third_party/WebKit/Source/platform/CrossThreadCopier.h
index de30baa00edcbd544efed937b4cce778f137a8a7..46448693ad2aed06db012efa407e1558948ea286 100644
--- a/third_party/WebKit/Source/platform/CrossThreadCopier.h
+++ b/third_party/WebKit/Source/platform/CrossThreadCopier.h
@@ -158,16 +158,6 @@ struct CrossThreadCopier<PassOwnPtr<T>> {
 };
 
 template <typename T>
-struct CrossThreadCopier<WeakMember<T>*> {
-    STATIC_ONLY(CrossThreadCopier);
-    typedef WeakMember<T>* Type;
-    static Type copy(Type ptr)
-    {
-        return ptr;
-    }
-};
-
-template <typename T>
 struct CrossThreadCopier<WTF::PassedWrapper<T>> {
     STATIC_ONLY(CrossThreadCopier);
     using Type = WTF::PassedWrapper<typename CrossThreadCopier<T>::Type>;
@@ -225,17 +215,6 @@ struct CrossThreadCopier<Member<T>> {
     }
 };
 
-template <typename T>
-struct CrossThreadCopier<WeakMember<T>> {
-    STATIC_ONLY(CrossThreadCopier);
-    static_assert(IsGarbageCollectedType<T>::value, "T must be a garbage-collected type.");
-    typedef T* Type;
-    static Type copy(const WeakMember<T>& ptr)
-    {
-        return ptr;
-    }
-};
-
 // |T| is |C*| or |const WeakPtr<C>&|.
 template <typename T>
 struct AllowCrossThreadAccessWrapper {