Remove bionic test's dependency on gtest internal.

It is wrong to depend on internal ABI. And in the new version, they
explicitly disabled that.
https://github.com/google/googletest/commit/b3d9be5c1d969dfdbf1f1ff924b9fd1be5eaecc9

Test: run test
Change-Id: I194a1e9417df2c52872b6eca6b61fb392e07cd29