callback_b_        70 base/callback_unittest.cc   const Callback<void(void)> callback_b_;  // Ensure APIs work with const.
callback_b_        97 base/callback_unittest.cc   EXPECT_FALSE(callback_b_.is_null());
callback_b_       102 base/callback_unittest.cc   EXPECT_FALSE(callback_a_.Equals(callback_b_));
callback_b_       103 base/callback_unittest.cc   EXPECT_FALSE(callback_b_.Equals(callback_a_));