base::Bind is intended to reject raw pointers to ref-counted types unless it's a this pointer.
E.g.:
  struct Foo : base::RefCounted<Foo> {};
  void Bar(Foo*) {}
  void Baz(scoped_refptr<Foo>) {}

  Foo* p = nullptr;
  base::Bind(&Bar, p);  // Should be compile error.
  base::Bind(&Baz, p);  // Should be compile error.

base::Bind implementation has a static_assert to ban this pattern. However, the check has been regressed from some point and those base::Bind usages compile.

Context: https://groups.google.com/a/chromium.org/d/msg/chromium-dev/qH5swrLHPmg/6E1FE5okAgAJ